题目
题型：不详难度：来源：
Succession occurs because plants and animals cause a change in the environment in which they live. The first weeds and grasses that appear on a bare field, for example, change the environment by shielding the soil from direct sunlight. As these plants spread, the ground becomes cooler and more moist than it was originally. Thus, the environment at the ground surface has been changed. The new surface conditions favor the sprouting（产生）of shrubs. As shrubs grow, they kill the grasses by preventing light from reaching them and also enhance (增加)the soil. Pine seedlings (苗)soon take hold and as they grow, they in turn shade out the shrubs. They are not able to shade out oak and hickory (山核桃)seedlings, however, that have found the forest floor suitable. These seedlings grew into large trees that eventually shade out the pines.
小题1:The best title of this passage is _____.
| A．The Importance of Weeds and Grasses |
| B．The Success of Oak and Hickory |
| C．How Environmental Habitats Change |
| D．Animal and Plant Habitats |
| A．oak and hickory trees grow taller than pines |
| B．weeds and grasses prefer cold climate |
| C．pines and grasses can exist together |
| D．birds encourage the growth of shrubs |
| A．A forest cut down to build an airport. |
| B．A flood washing away a crop of wheat |
| C．Wild flowers growing in an unused parking lot |
| D．Animals being tamed (驯服)by children |
答案
小题1:C
小题2:A
小题3:C
解析
试题分析：这篇文章讲的是环境栖息地的改变，通过自然演替地球上的生活环境有了很大改观。
小题1:主旨题：从第一段的句子：Over a period of time, many habitats (栖息地)change with respect to the types of plants and animals that live there. This change is known as succession.可知这篇文章讲的是环境栖息地的改变，选C
小题2:细节题：从第二段的句子：Pine seedlings (苗)soon take hold and as they grow, they in turn shade out the shrubs. They are not able to shade out oak and hickory (山核桃)seedlings, however, that have found the forest floor suitable. 可知松树没有橡树和核桃树高，选 A
小题3:细节题：从第二段的句子：Succession occurs because plants and animals cause a change in the environment in which they live. The first weeds and grasses that appear on a bare field, 可知在不用的公园长出杂草是一种自然演替，选C
核心考点
试题【Over a period of time, many habitats (栖息地)change with respect to the types of pl】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
If blood is red, why are veins (静脉) blue?
Actually, veins are not blue at all. They are more of a clear, yellowish colour. Although blood looks red when it"s outside the body, when it"s sitting in a vein near the surface of the skin, it"s more of a dark reddish purple color. At the right depth, these blood-filled veins reflect less red light than the surrounding skin, making them look blue by comparison.
Which works harder, your heart or your brain?
Which works harder depends on whether you are busy thinking or busy exercising. Your heart works up to three times harder during exercise, and shifts enough blood over a lifetime to fill a supertanker. But, in the long run, your brain probably tips it, because even when you’re sitting still your brain is using twice as much energy as your heart, and it takes four to five times as much blood to feed it.
Why do teeth fall out, and why don"t they grow back in grown-ups?
Baby (or "milk") teeth do not last long; they fall out to make room for bigger, stronger adult teeth later on. Adult teeth fall out when they become damaged, decayed and infected by bacteria. Once this second set of teeth has grown in, you"re done. When they"re gone, they’re gone. This is because nature figures you"re set for life, and what controls regrowth of your teeth switches off.
Do old people shrink as they age?
Yes and no. Many people do get shorter as they age. But, when they do, it isn"t because they"re shrinking all over. They simply lose height as their spine(脊柱) becomes shorter and more curved due to disuse and the effects of gravity. Many (but not all) men and women do lose height as they get older. Men lose an average of 3-4 cm in height as they age, while women may lose 5 cm or more. If you live to be 200 years old, would you keep shrinking till you were, like 60 cm tall, like a little boy again? No, because old people don"t really shrink! It is not that they are growing backwards — their legs, arms and backbones getting shorter. When they do get shorter, it"s because the spine has shortened a little or, more often, become more bent and curved.
Why does spinning（旋转） make you dizzy (眩晕的)?
Because your brain gets confused between what you"re seeing and what you"re feeling. The brain senses that you’re spinning using special gravity-and-motion-sensing organs in your inner ear, which work together with your eyes to keep your vision and balance stable. But when you suddenly stop spinning the system goes out of control, and your brain thinks you"re moving while you"re not!
Where do feelings and emotions come from?
Mostly from an ancient part of the brain called the limbic system. All mammals have this brain area — from mice to dogs, cats, and humans. So all mammals feel basic emotions like fear, pain and pleasure. But since human feelings also involve other newer bits of the brain, we feel more complex emotions than any other animal on the planet.
If exercise wears you out, how can it be good for you?
Because our bodies adapt to everything we do to them. And as far as your body is concerned, it’s "use it, or lose it”! It"s not that exercise makes you healthy; it"s more that a lack of exercise leaves your body weak and easily affected by disease.
小题1:What is the color of blood in a vein near the surface of the skin?
| A．Blue. | B．Light yellow. | C．Red. | D．Dark reddish purple. |
| A．Because their spine is in active use. |
| B．Because they are more easily affected by gravity. |
| C．Because they keep growing backwards. |
| D．Because their spine becomes more bent. |
| A．In the long run, our brain probably works harder than our heart. |
| B．When our brain senses the spinning, we will fell dizzy. |
| C．The brains of the other mammals are as complex as those of humans. |
| D．Our feelings and emotions come from the most developed area in our brain. |
| A．To give advice on how to stay healthy. |
| B．To provide information about our body. |
| C．To challenge new findings in medical research. |
| D．To report the latest discoveries in medical science. |
The first regularly published newspaper in English was printed in Amsterdam in 1620. In 1621, an English newspaper was started in London and was published once a week. The first daily English newspaper was the Daily Courant, which came out in March 1702.
In 1690, Benjamin Harris printed the first American newspaper in Boston .But not long after it was first published, the government stopped the paper. In 1704, John Campbell started the Boston Newspaper, the first newspaper published daily in the American colonies（殖民地）. By 1760, the colonies had more than thirty daily newspapers.There are now about 1, 800 daily papers in the United States.
Today, as a group, newspapers in English have the largest circulation (发行量)in the world .But the largest circulation for a newspaper is that of the Japanese newspaper Asahi Shimbun . It sells more than eleven million copies every year.
小题1:The first regularly printed European newspaper started in ________.
| A．Rome in 59 BC | B．Germany in 1609 |
| C．Amsterdam in 1620 | D．England in 1621 |
| A．1620 | B．1621 | C．1590 | D．1702 |
| A．History of newspapers |
| B．History of daily newspapers |
| C．The beginning of newspapers |
| D．On reading newspapers |
Since natural evolution is extremely slow and mankind’s selective production programs only take a few generations to produce a completely new species, natural evolution has already taken a back seat to mankind’s production programs. In addition, mankind has successfully killed off several species all together. For example, there are no more European wolves in existence and mammoths (猛犸象) probably died out because of mankind. Even certain diseases have been permanently got rid of from the planet, and dozens of other diseases will soon be too. Again, natural evolution did i»t cause most of the destruction during man’s rule of the world.
Currently, scientists are creating new species with desired characteristics in the lab significantly faster than natural evolution creates new species. In a single generation, new species can be created and destroyed by mankind, while natural evolution could take thousands of years to do the same but only accidentally. Scientists are even able to replace defective (有缺陷的) or damaged genes with different genes to attempt to cure genetic defects. This is something that natural evolution could possibly never correct.
Eventually scientists will even be able to improve the quality of people. For example, imagine not only correcting your eyesight with gene treatment, but also ensuring that all of your children do not receive your old genes of poor eyesight too. Scientists will one day be able to improve the memory and intelligence of your children, so that they will do better in school and achieve more in life. Doctors and scientists will be able to customize (订制) babies before they are born just like picking options at a car store.
小题1:According to the first paragraph,______ .
A. man-made evolution has improved all species
B. man-made evolution has weakened some species
C man-made evolution can make up for all natural losses
D. natural evolution won’t happen without man’s assistance
小题2:What does the underlined part “taken a back seat to” in Paragraph 2 mean?
A. Become powerful assistance to.
B. Become a huge barrier to.
C Speeded up the process of.
D. Played a less important role than.
小题3:What does the third paragraph mainly talk about?
| A．Why natural evolution happens so slowly. |
| B．The way scientists adopt to have genetic defects repaired. |
| C．The advantages of man-made evolution over natural evolution. |
| D．How scientists make use of man-made evolution to create new species. |
| A．Near-sighted parents will be able to produce babies with good eyesight in the future. |
| B．Doctors and scientists will be responsible for mass production of babies in the future. |
| C．It is natural evolution that is to blame for the destruction of European wolves and mammoths. |
| D．Children can now have their memory and intelligence improved with the help of gene treatment. |
For many centuries, people used windmills to grind(碾碎) wheat into flour or pump water from deep underground. When electricity was discovered in the late 1800s, people living in remote areas began to use them to produce electricity. This allowed them to have electric lights and radios. However, by the 1940s when electricity was available to people in almost all areas of the United States, windmills were rarely used.
During the 1970s, people started becoming concerned about the pollution that is created when coal and gas are burned to produce electricity. People also realized that the supply of coal and gas would not last forever. Then, wind was rediscovered, though it means higher cost. Today, there is a global movement to supply more and more of our electricity through the use of wind.
小题1:From the text we know that windmills________.
| A．were invented by European armies |
| B．have a history of more than 2,800 years |
| C．used to supply power to radio in remote areas |
| D．have rarely been used since electricity was discovered |
| A．Sailing a boat. |
| B．Producing electricity. |
| C．Grinding wheat into flour. |
| D．Pumping water from underground. |
| A．wind power is cleaner |
| B．it is one of the oldest power sources. |
| C．it was cheaper to create energy from wind |
| D．the supply of coal and gas failed to meet needs |
| A．The advantages of wind power. |
| B．The design of wind power plants. |
| C．The worldwide movement to save energy. |
| D．The global trend towards producing power from wind. |
When it comes to sleep temperature, experts recommend following the principle: not too cold, not too hot, but just right. “People seem to sleep best at temperature between 62 and 70 degrees F,” says Dr. Alice Hoagland. When the surrounding temperature falls too low, it can rouse you from sleep. A good blanket helps drive the coldness away.
At the other extreme, overheating yourself can affect your sleep as well. “Core body temperature typically drops during the first four hour’s of sleep,” says Dr. Hoagland. This decline in body temperature helps you fall asleep and stay asleep.
“In medical care, weighted blankets are one of our most powerful tools for helping people who are anxious, upset, and possibly losing control,” says Dr. Karen Moore. These special blankets are filled with weighted pellets. Weighted blankets are also marketed for general use as an aid to sleep and relaxation. Like a firm hug, weighted blankets help us feel safe.” This is the reason why many people like to sleep under a blanket even in summer.
“If you want to try this type of blanket, the best weight depends on your body size and personal preference. However, 15 to 30 pounds is typical for adults,” Moor says. She adds that weighted blankets are not recommended for those recovering from surgery.
“People can also have serious preferences for a particular blanket,” says Dr. Hoagland. “Regularly using a favorite blanket for sleep can help to develop a conditioned response so that sleep is quicker.” In fact, many sleep centers ask patients to bring their own blanket and pillow from home, which helps them fall asleep more easily.
小题1:The author wrote the passage mainly to tell us _____.
| A．the importance of blankets |
| B．how to choose the perfect blanket |
| C．different materials used to make blankets |
| D．the history and usage of blankets |
| A．wake up | B．take up | C．make up | D．pick up |
| A．Body temperature rises when we fall asleep |
| B．The perfect sleep temperature should be above 70 degrees F. |
| C．Weighted blankets should be at least 30 pounds. |
| D．People are advised to use their own blankets. |
最新试题
- 1有三个电阻，电阻值分别是a欧、b欧、c欧，其中a>b>c，当把它们并联相接，总电阻为R，它们的大小关系，下列
- 2He was born ______ a cold winter morning.A．onB．inC．atD．/
- 3当x＞0时，反比例函数y=-2x的图象在（ ）A．第二象限B．第四象限C．第二或第四象限D．第一或第三象限
- 4在中，,， 在边上，且,则（ ）A．B．C．D．
- 5下列句子没有运用修辞手法的一项是[ ]A．水淀里没有一个人影，只有一团白绸子样的水鸟，也躲开鬼子往北飞去，落到大
- 6美洲黑人的祖先来自非洲，之所以来到美洲是因为（ ）A．找工作赚钱B．跟着哥伦布航海到美洲C．被殖民者贩运到美洲 D．
- 7如图，设F为正方形ABCD上一点，CE⊥CF交AB的延长线于E，若正方形ABCD的面积为64，△CEF的面积为50，则△
- 8考古学家通过始祖鸟化石标本发现，其股骨长度x（cm）与肱骨长度y（cm）线性回归方程为，由此估计，当肌骨长度为50cm时
- 9动词填空 用括号内所给动词的适当形式填空 (本大题共8分，每小题1分)小题1:The fish on the plate
- 10现有A～G七种物质，已知A是赤铁矿的主要成分， E的浓溶液稀释时会放出大量的热，G溶液为蓝色，它们之间存在如右图所示的转
热门考点
- 1She wants to find a job in the kindergarten because_____ wor
- 2在我国，公民在法律面前一律平等，任何组织和个人都没有超越法律的特权，体现的是[ ]A．有法可依
- 3“酒是陈的香”，就是因为酒在储存过程中生成了有香味的乙酸乙酯，在实验室我们也可以用下图所示的装置制取乙酸乙酯。回答下列问
- 4如图是制作洋葱鳞片叶表皮临时细胞的实验步骤，请据图回答：（1）如图所示，制作洋葱表皮细胞临时装片正确的操作顺序是____
- 5平行投影与中心投影之间的区别是 ______．
- 6下列个物体中，是一样物体的是（ ）（填相同图形的序号）。
- 7下列各句中，划线成语使用不正确的一项是A．为什么麻烦总是找上自己？小苏百思不得其解。听了黄师傅的话，他顿觉醍醐灌顶，找到
- 8根据提示，默写填空。⑴ 鸟向檐上飞， 。⑵ ，影入平羌江水流
- 9【题文】仿照下面的示例，以“成长”为话题，根据语境仿写两组适当的句子，要求内容贴切，句式与示例相同。（6分）毛毛虫在艰难
- 10不定项选择下列叙述中正确的是（ ）A．棒状分子、碟状分子和平板状分子的物质呈液晶态B．利用液晶在温度变化时由透明变浑