Below is a description of a single scientific experiment . It shows us how iron reacts ( 反应) with air and
with water.
Aim : To find out if iron rusts( 生锈) (a) in dry air ; (b) in water that has no air in it ( air- free water) ; (c)
in ordinary water.
Materials : 3 clean iron nails ( 铁钉) ; test tubes ; test tube holder ; cotton wool ; oil ; Bunsen burner. | Iron in dry air
Method
(1)Put some iron nails at the bottom of a test tube.
(2)Push some cotton wool down the tube.
(3)Leave the tube for one week.
Result
After one week, the nails have not rusted.
Conclusion
Iron does not rust in dry air.
Iron in air-free water
Method
(1)Half-fill a test tube with water.
(2)Boil the water for three minutes.( This makes sure
there is no air in the water.
Put two or three clean nails in the water. | (4)Add some oil to the water. ( This will keep
air out of the water.)
(5) Leave the tube for one week.
Result
The nails do not rust in the tube with air-free
water.
Conclusion
Iron does not rust in air- free water.
Iron in ordinary water
Method
(1)Half -fill a test tube with water and add two
or three clean nails.
(2)Leave the tube for one week.
Result
The nails rust in the tube with ordinary water.
Conclusion
Iron rusts in ordinary water. |
| 1-3 ADC |
核心考点
试题【阅读理解。A Simple Scientific ExperimentBelow is a description of a single scientific】；主要考察你对 教育文化类等知识点的理解。 [详细]举一反三
| 阅读理解。 | Doing experiments can be interesting, and you may try the following experiments at home.
Make sure that you’ll do them with an adult. |  | | 1. How many experiments are there in the pictures? | A. Six.
B. Five.
C. Three.
D. Two. | | 2. The following are the instructions on how to do “Step 2” in these experiments. Which one is the right order? | a. Pour 3/4 of the water away. b. Put a balloon on the bottle.
c. Put the bottle in a bucket of hot water. The air rises into the balloon.
A. a, b, c
B. a, c, b
C. b, a, c
D. c, a, b | | 3. What can you see in the bottle at last in Experiment A? | A. Some ice.
B. Some water.
C. Some ice and water.
D. A cloud and some water. | | 4. What will happen to the balloon in “Step 3” in Experiment C? | A. It will be bigger.
B. It will be broken.
C. It won’t change.
D. It will be in the bottle. | | 完形填空。 | Self reflection means stopping the mad rush of activity and calming yourself and your mind so your
brain can evaluate (评价) the input it has already received. Some people prefer to do __1__ self reflections mentally,while others keep a diary or written notes of some kind. Whether written or purely mental,the
__2__ is the same.
School textbooks are often divided into units of study. This can make it __3__ for someone who
wants to begin the process of self reflection to get started. Wait times when you complete a unit of study in
any of the __4__ you are learning:math,science or any other topic. Sometimes you are reminded that the
unt is over __5__ there is so** test. Use these natural breaks as chances to stop and reflect.
__6__ a quiet place. This can even be sitting at your desk at school when you finished early and the
other students are __7__ working. If you are going to take notes,take your reflection diary. Write doen
some __8__ on things that you learned in this uont ont know before you began. Let your mind ponder
(思考) on the notes you have written some connections. Next,think about the things that you still wonder
about. __9__ learned a new way to solve a math problem, but you?re not sure whe n to use it. Write
questions will help you remember to 10 eeking answers the next time you are expert the same topis.
Self reflection is an essential skill for a successful student. If you have never taken the time to reflect, try
it now. | ( )1. A. our
( )2. A. promise
( )3. A. easier
( )4. A. questions
( )5. A. instead of
( )6. A. Pass
( )7. A. still
( )8. A. evidence
( )9. A. On time
( )10. A. stop | B. your
B. profile
B. slower
B. subjects
B. because
B. Lose
B. seldom
B. answers
B. For example
B. decide | C. their
C. program
C. busier
C. certificates
C. because of
C. Find
C. almost
C. mistakes
C. Right now
C. forget | D. its
D. process
D. tougher
D. activities
D. than
D. Refuse
D. never
D. notes
D. In all
D. continue | | 阅读理解 | 
On June 26, 2000, two scientists, called Francis Collins and Craig Venter, told the world that they
could now read the whole "map" of the human body: DNA. DNA is something that everybody has, and
it tells the body what to do. DNA is the reason that we look like our mother and father, because we get
some of their DNA to make our own.
People have been trying to understand the human body for a long time. In 1860, Gregor Mendel
discovered a special reason why we look the same as other people in our family. It is because of small
things named "genes" in our body. In 1953, James Watson and Francis Crick made another discovery
and found out that those small parts are real messages written in the DNA with a special language.
In 1961, Marshall Nirenberg and Johann Matthaei found a message in DNA showing how DNA
tells the cell (细胞) to build its parts. Scientists have now found all the words in the DNA map, but we
still do not understand what they all do. By understanding what just one "word" means, we can help
save more people from several illnesses.
Most people hope that this will help make better medicine and help sick people. Other people worry
that when people begin to know more words and find out lots of other information, we might use it in a
wrong way, just to make people more attractive, or stop sick people from getting jobs. Man would have
to meet a lot of trouble if DNA technic wasn’t limited in use. | | 根据短文内容，选择最佳答案。 | | 1. When did we first know why we look like other people in our family? | A. In 1860.
B. In 1953.
C. In 1961.
D. In 2000. | | 2. What does the underlined word "gene" mean? | A. The "map" of DNA.
B. A special language.
C. Small parts of DNA.
D. DNA. | | 3. What did the two scientists first discover in 1961? | A. The "map" of DNA.
B. A new illness.
C. The language of DNA. 
D. A message of DNA. | | 4. What can we do if we understand some "words" of the language inside the body? | A. Make people get new jobs.
B. Make medicine for illnesses.
C. Make maps of human.
D. Make people less attractive. | | 5. What do people think about this work? | A. It can cause good or bad resutls.
B. It can cause only good results.
C. It can cause good results but won’t work.
D. It can cause only bad results. | | 阅读理解。 | Have you ever heard someone use the phrase"once in a blue moon"? People use this expression to
describe something that they do not do very often. For example, someone might say that he tries to
avoid eating sweets because they are unhealthy, but will eat chocolate"once in a blue moon". Or
someone who does not usually like to go to the beach might say " I visit the shore once in a moon."
While many people use this phrase, not everyone knows the meaning behind it.
The first thing to know is that the moon itself is never really blue. This is just an expression fact, the
phrase "blue moon" has to do with the shape of the moon, not the color.
As the moon travels around the earth , it appears to change shape. We associate names with certain
shapes of the moon. For example, when we can see a small part of the moon is called a crescent moon.
A crescent is a shape that looks like the tip of a fingernail When we cannot see the moon at all, it is called
a new moon.
When we can see the whole moon is called a full moon. Usually, there is only one full moon every
month. Sometimes , however will be two full moons in one month. When this happens, the second full
moon is called a moon".
Over the next 20 years, there will only be 15 blue moons. As you can see, a blue moon every rare
event. This fact has led people to use the expression "once in a blue moon" to other very rare events in
their lives. | 1. Which of the following would be a good example of using the phrase"once in a blue moon".
A. Simon often tells jokes. Simon tells jokes once in a blue moon.
B. Tom rarely remembers to do exercise. Tom does exercise once in a blue moon.
C. Mary likes to go shopping every weekend. Mary goes shopping once in a blue moon.
D. Cindy nates to stay up, but she stays up every day. Cindy stays up once in a blue moon.
2. When does a blue moon happen in nature?
A. When the moon has a blue moon.
B. When we cannot see the moon at all.
C. When there are two full moons in one month.
D. When we can only see a small part of the moon.
3. Which of the following is another example of something that has a shape?
A. The letter "O"
B. The letter "M"
C. The letter "H"
D. The letter "C"
4. How often will a blue moon happen over the next twenty years?
A. Once a year.
B. Less than once a year.
C. More than once a year.
D. At least twice a year.
5. What does the underlined part "This fact" in the last paragraph refer to (所指)?
A. A blue moon is a very rare event.
B. The moon appears to change shape.
C. The moon itself is never really blue.
D. A blue moon has to do with the shape of the moon. | | 阅读理解 | Every day in China, about 200 million children go to school. Many of them take school buses.
Last year, a serious school bus accident happened in China,when a nine-seat minibus crashed.There were 62 children inside ,and 21 of them died. To stop such accidents, the Center Government decided
to strengthen(加强)the rules for school buses.
On April 5, the Government published new rules about school safety. These new rules are much
stricter than the old ones.
Under the new rules, local governments must make sure that students attend nearby schools or
boarding (寄宿的)schools to reduce traffic risks(风险). Also, local governments must help kids in the
countryside reach their school buses.
From now on ,school buses have a speed limit(限速)of 80km per hour on highways and 60km per
hour on normal roads. While on the road, other cars must let school bus go first.
The new rules also say that school buses must never be overloaded(超载).
There are many other rules as well. A school bus must have than seven seats. On each bus, there
must be at lest one adult(成年人)to keep an eye on the kids. Each school bus must have a fire
extinguisher(灭火器),a first aid kit(急救箱)and a GPS. | | 1. What does the underlined word"attend"mean? | A. join in
B. drop out
C. go to | | 2. Under the new rules, which of the following is TRUE? | A. School buses can be overloaded when necessary.
B. School buses can go first when there are other cars.
C. School buses must driver 80km/h or less on normal roads. | | 3. According to the new rules, a school bus must have the following EXCEPT . | A. more than seven seats.
B. a parent of one of the students.
C. a fire extinguisher and a first aid kit. | | 4. The government made new rules for school buses because . | A. school buses in China were not safe enough before.
B.62 students died in a school bus accident last year
C. 200 million children in China go to school by bus every day. | | 5. What"s the best title of this passage? | A. How to Avoid Bus Accidents
B. Safety First on School Buses
C. Bus Speed Limit Is Necessary |
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