题目
题型：期中题难度：来源：
First prepare the following items:
●2 glass containers(容器) that need to be the same size and shape
●1 gallon plastic bag
●4 cups of very cold water
●Ice cubes
Fill each container with two cups of cold water. Add the same amount of ice cubes to each container. Then put one of the containers in the plastic bag and close it tight. Put both containers in the sun together and keep them there for at least an hour.
At the end of one hour remove the container from the plastic bag and immediately check the temperature of the water. After you record this, find out the temperature of the water that is not covered.
When you place the containers in direct sunlight, the air inside the bag becomes very warm. The heat filters (渗入) in but cannot escape so it stays in the closed plastic bag and increases the temperature. What if you leave that for two, three or four hours?
Think about what is happening to the Earth. There are chemicals that are creating a type of plastic bag around the Earth. It causes our air to get warmer because of the heat from the sun being kept in this closed area.
Think about your car in the hot summer. This is what happens when you leave your car outside all day. This greenhouse effect has caused your car to be so hot that you sometimes cannot even touch the steering wheel.
This science project goes to show what affects our planet.
1. According to the text, the greenhouse effect appears mainly because of ________.
A. the hot sunlight
B. chemicals around the Earth
C. the plastic bag
D. human activities
2. Which of the following shows the right order of steps for the science project?_______
a. Measure the water which is not covered.
b. Make preparations for the project.
c. Fill each of the two glass containers with two cups of cold water.
d. Put one container in a plastic bag and close it tight.
e. Put the two containers in the sun for at least one hour.
f. Measure the water which is covered with a plastic bag.
A. b e d c a f
B. b c d e f a
C. b c e d a f
D. b e c d f a
3. The writer mentions a car on a hot summer day to _______.
A. tell us about the hot weather in summer
B. prove the science project is correct
C. show the effects of the greenhouse effect
D. tell us how to protect cars during summer
4. If the story appears in a newspaper, the best title might be "________".
A. An Interesting Experiment Done by Kids
B. How to Protect Our Precious Planet
C. Bring Home the Seriousness of Greenhouse Effect
D. The Greenhouse Effect Has Been Proved by Kids
答案
核心考点
试题【 Everyone talks about the greenhouse effect(温室效应) and how our Earth and its 】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
the risk of dehydration (脱水) . But athletes now know they can also get into trouble by drinking to much .
To much water intake can lower levels of sodium (钠) in the blood . The death of a 28-year-old woman
following the Boston Marathon caught the attention of many runners and led to new research .
Experts advise long distance runners to replace the liquids they sweat out . Their goal is to try to keep
someone from not getting dehydrated by more than 2 percent of their body weight .
One technique for deciding how much water you need is to get the exact numbers . Runners have to
weight themselves before and after a run to determine how much water they"ve lost . If their weight drops
by more than 2 percent , they have not drunk enough water.
Hyponatremia occurs when runners drink so much water that blood salt levels drop off . A study
published last year tested 488 runners who completed the Boston Marathon and found 13 percent of them
had dangerously low blood salt levels . The first sign that runners may notice is slightly swelling in the
hands . They can"t get their rings off , and then they might feel sick . They may not remember where they
are . In fact , most runners get enough salt to get back to normal levels by eating just one meal after a run .
Contrary to the old advice that runners should drink as much as they can to prevent dehydration , the new
research has shown that the body is a remarkable machine that actually tells you via thirst when you need
water .
B．the long distance runners who need help
C．how to manage water intake during a marathon
D．a 28-year-old woman who died after a Boston Marathon
B．They can learn how much salt there is in the blood .
C．They ca know the quantity of water they"ve lost during a run .
D．They can decide what kind of water they should take during a run .
B．Either too much or to little of water intake is harmful .
C．A rich meal is helpful to our performance in a run .
D．We should take enough salt during a run .
B．Too much water intake→blood salt levels ?→hyponatremia .
C．No water intake→blood sodium levels↑→hyponatremia .
D．No water intake →blood salt levels ?→hyponatrenmia .
food is very important. It can help your body grow strong, so take care of what you eat.
There are four main food groups altogether. The dairy group(乳制品) has food like milk,
cheese and sour milk. The other three groups are the meat and fish group, the fruit and
vegetable group, and the bread and rice group. Each meal should have at least one food from all
four main groups. With all these food together, you will be given enough energy during the day.
It is easy to get into bad eating habits. You may eat your breakfast in a hurry to get to school
on time. Or you may not have time for a good lunch. It may seem easy to finish your supper with
fish and chips all the time. But you will find yourself tired in these days and you can not think
quickly.
Watching what you eat will help keep your body healthy and strong. It is also good to take so
me exercise. It will help you eat more if you take a walk or play games in the open air. Having a
good eating habit with some exercise is the key to your health.
1. Which of the following diets do you think is the best one?
A. Milk, bread, cabbage and beef.
B. Eggs, tomatoes and chicken.
C. Corn, fish, cream and pork.
D. Rice, beancurd, apples, fish and chicken.
2. Which of the following is a good eating habit?
A. Going to school without any breakfast.
B. Eating fish and chips for supper all the time.
C. Finishing your lunch in a very short time.
D. Having at least one food from all four groups each meal.
3. In the passage the writer mainly tells us that _____.
A. every person needs food to grow well
B. taking exercise can keep your body strong
C. right kind of food with exercise will keep you healthy
D. enough energy helps people think more quickly
4. The best title for the passage is _____.
A. The Four Food Groups
B. A Healthy Diet
C. Your Body and Food
D. The key to Your Health
on a tour of the world"s natural resources (资源). How are they used? What has been lost? What
remains and is it able to continue with the present speed of use? Wilson also points out the need to
understand fully the biodiversity (生物多样性) of our earth.
Wilson begins with an open letter to the pioneer in environment (环境) protection, Henry David
Thoreau. He compares today"s Walden Pond with that of Thoreau"s day. Wilson will use such
comparisons for the rest of the book. The problem is clear: man has done great damage to his home over
the years. Can the earth, with human help, be made to return to biodiversity levels that will be able to
support us in the future?
Biodiversity, Wilson argues, is the key to settling many problems the earth faces today. Even our
agricultural crops can gain advantages from it. A mere hundred species (物种) are the basis of our food
supply, of which but twenty carry the load. Wilson suggests changing this situation by looking into ten
thousand species that could be made use of, which will be a way to reduce the clearing of the natural
homes of plants and animals to enlarge farming areas.
At the end of the book, Wilson discusses the importance of human values in considering the
environment. If you are to continue to live on the earth, you may well read and act on the ideas in this
book.
1. We learn from the text that Wilson cares most about ______.
A. the environment for plants
B. the biodiversity of our earth
C. the waste of natural resources
D. the importance of human values
2. How many species are most important to our present food supply?
A. Twenty.
B. Eighty.
C. One hundred.
D. Ten thousand.
3. Wilson suggests that one way to keep biodiversity is to ______.
A. learn how to farm scientifically
B. build homes for some dying species
C. make it clear what to eat
D. use more species for food
4. We can infer that the text is ________.
A. a description of natural resources
B. a research report
C. a book review
D. an introduction to a scientist
carbon dioxide out of the atmosphere. However, it now turns out that planting trees could add to global
warming. We all know that tree roots do a great job of keeping soil firmly on the ground and out of the
wind"s power. The problem is that some of the dust clouds play an important part in soaking up carbon
dioxide.
Huge dust storms blow out over the oceans from dry parts of North Africa and Central Asia. Tons
of dust are lifted and left as a thin film over the ocean surface.
Dust from China is carried east and left in the Pacific Ocean. If a treeplanting programme there is
successful and the dust supply reduced, the net result may be that less carbon dioxide gets locked away
in the ocean.
Andy, an environmental scientist has spent the past few years studying dust and says his work shows
clearly the complexity of the system. For this reason the need is to focus on cutting carbon dioxide giving
off rather than doing anything else.
Robert, an American scientist, has shown that when native grassland areas are invaded by trees,
carbon is lost from the soil. "We are studying why the soil carbon disappears, but one theory is that trees
do a lot more of their growing above ground compared to grass, so less carbon goes directly into the soil
from trees." said Robert.
In wet areas of the world, the gain from trees absorbing carbon dioxide above ground seems to be
outweighed by the loss of carbon from the soil below ground.
Countries that plan to fight against global warming by planting trees may have to think again. Solutions
to environmental problems are often more complex than they first appear, and understanding the Earth"s
climate is a very great challenge.
1. People usually hold the opinion that ________.
A. huge dust storms can destroy carbon dioxide
B. planting trees could reduce global warming
C. huge dust storms can destroy the oceans on the Earth
D. planting trees is the only way to control huge dust storms
2. Andy, an environmental scientist, believes that________.
A. environmental problems are more complex than expected
B. trees shouldn"t have been planted in dry places
C. dust plays a more important part than trees
D. carbon dioxide is harmful to everything
3. Robert"s experiment proves that ________.
A. trees absorb more carbon than grass
B. carbon can turn grass into dust
C. less carbon can make trees grow faster
D. grassland areas should be covered by forests
4. The best title for this passage is "________".
A. The importance of planting trees
B. The dust clouds soak up carbon dioxide
C. Is it really useful to plant trees to reduce global warming?
D. Why the soil carbon disappears
itself -there is no such thing as a high incidence rates (发生率)of cancer . Except for lung cancer,
mostly caused by cigarette smoking ,the incidence rates are not on the rise. However, some kinds
of cancer are decreasing. But the fear of cancer is catching, and the country stands at risk of an
anxiety. The earth itself is coming to seem like a huge carcinogen(致癌物). The ordinary, more or
less, scientific statement that something between 80 and 90 percent of all cancers are due to things
in the environment is taken to mean that none of us will be safe until the whole environment is
"cleaned up." This is not at all the meaning.
The 80-percent calculation is based on the unthinkable differences in the incidence of cancer
in various societies around the world - for example, the high incidence of liver cancer in Africa and
the Far East, stomach cancer in Japan, breast cancer in Western Europe and North America, and
the relatively low figures for breast cancer in Japan and parts of Africa and for liver cancer in America.
These data shows there may be specific environmental influences, but largely based on personal
life-style, which determines the incidence of various forms of cancer in different communities - that is
all the data suggests. The overall incidence of cancer, counting up all the cases, is probable roughly
the same everywhere.
1. According to the passage, the incidence of cancer is generally believed _____.
A. to be based on inactive life style
B. to be due to anxiety
C. to result from environmental influences
D. to be caused by heavy smoking
2. It can be inferred from the passage that the writer"s opinion about the relationship between
cancer and environment is_____.
A. positive
B. negative
C. neutral
D. approving
3. According to the passage, the writer seems to feel that_____.
A. cancer risk is on the rise
B. the whole earth resembles a huge carcinogen
C. the risk of catching cancer is not so great as most people think
D. cancer can be cured sooner or later
4. Which of the following would be the best TITLE for the passage?
A. Cancer and Environment
B. The Fear Caused by Cancers
C. Data on Cancer Incidence
D. Cancer and its Investigation
最新试题
- 1提高生活质量的物质基础是（ ）A．消费水平的高低B．合理的消费结构C．良好的生活环境D．充足的闲暇时间
- 2下列是关于“观察洋葱鳞片叶表皮细胞的结构”实验中的一些问题，请分析回答：（1）用显微镜进行观察，当镜筒下降时，眼睛应注视
- 3(不等式选讲选做题)若的最小值为3, 则实数的值是________.
- 4从一批产品中取出三件产品，设A={三件产品全不是次品}，B={三件产品全是次品}，C={三件产品不全是次品}，则下列结论
- 5请根据所学的人体生理知识，回答下列问题：（10分）(1)人饮酒后酒精进入人体，主要被消化系统最膨大的器官 和小肠吸
- 6下列文句，哪一组前后意思相同[ ]A．喝酒后绝不开车//开车后绝不喝酒B．人才来自各方//人才自各方来C．反守为
- 7China hopes ____ United Nations Security Council"s latest mo
- 8游戏的公平性是指双方获胜的概率（ ）
- 9已知x，y，z∈R+，x-2y+3z=0，则y2xz的最小值______．
- 102011年中国春晚流行语“爱我你就抱抱我”，下列流行语中，出现于新中国改革开放时期的一组是（ ）A．解放 土地 三大
热门考点
- 1请填上合适的单位或数值：（1）在高速公路上行驶的汽车速度为30 ；（2）人的头发直径约为70
- 2我国成功地取得了2008年奥运会的主办资格。提出的“新北京，新奥运”的申办口号，其含义不包括（ ）A．绿色奥运B．科
- 3第30届奥运会于英国伦敦夏令时（比标准时间快一小时）7月27日20：12开幕，图1是开幕当日四个城市的昼夜长短分布示意图
- 4右图是人体心脏结构示意图，据图回答下列问题：（5分）⑴体循环开始于[ ] ，结束于[ ]
- 5如图，在3×3正方形网格中，顶点是网格线的交点的三角形叫做格点三角形，给出下列命题：①一定存在全等的两个格点三角形②一定
- 6材料一：2001～2010年中国网络营销产业规模注1：中国网络营销产业规模包含网络广告搜索与引擎收入；其中，网络广告收入
- 7写作。以My favorite animal为题描述你最喜欢的动物，文章必须回答以下问题。（60-80词）:What"s
- 8足量的盐酸与250g碳酸钙反应，生成二氧化碳的质量是多少？
- 9The kids seated themselves ______ to the teacher and listene
- 10 中国科学院可持续发展战略研究组将人类社会划分为四个发展阶段，读“人类社会不同发展阶段人口增长的示意图”，回答（1