2. I am glad to see that he speaks English a lot of better than before.

1. He ran fast and fast when he was near the fishing line.

5. 中国的人口比世界上其他任何一个国家都要多。 

The population of China is        country in the world.

4. 她唱得真好啊！这是我听到的最美的歌喉。 

How beautifully she sings!I've never heard         .

3. 随着时间的推移，他发现和她相处变得越来越难。 

As time went by,he found it        to get along with her.

2. 你越粗心，犯的错误就会越多。 

The more careless you are,       .

1. 在新设备被引人之后，他们今年生产的机器比前一年生产的机器多两倍。 

After the new equipment was introduced,they produced        this year than the year before.

 beautiful,serious,carefully,comfortable,much,impatient

2. Well,I'd rather have a house     to look,but       to live in.

3. She had to wait a very long time. The longer she waited,the      she became.

4. Her illness was much       than we had thought at first.

5. I asked Jim instead of Jack for help because he was     helpful than Jack.

   My friend Paul will never forget his first chemistry teacher. He was a lit?tle man with thick glasses,but he had a strange way of making his classes lively and interesting. And his lessons were not easily forgotten.

  Paul remembers one of his first lessons from this teacher. After the students were all in the chemistry lab,the teacher brought out three bottles. One was filled with petrol,one with castor oil (蓖麻油) and one with vinegar (醋) ."Now watch carefully," said the teacher.

  He then filled a cup with some of the petrol,some of the castor oil and some of the vinegar. As the students watched him quietly,he mixed the three together. After that,he held up one of his fingers and showed it to the class. He then dipped it into the cup. After a few seconds he took his finger out. "Now watch," he said.   "Remember,you must do everything as I do.” He put a finger in his mouth,tasted it and smiled,looking rather pleased. Then he handed the cup around the class of students. Each student dipped a finger into the mixture and sucked it. Instead of smiling,each of them made a face. The mixture tasted terrible.

  When the cup was at last returned to the teacher,he said sadly, "I'm sor?ry .none of you watched carefully enough. Yes,I sucked a finger,but the fin?ger I put into my mouth was not the one I had dipped into the cup." It was Pauls first important lesson as a student of chemistry and he never forgot it.

6. What did the teacher fill a cup with?

   A. Some petrol and some castor oil.

   B. Some petrol and some vinegar.

   C. Some castor oil and some vinegar.

   D. Some petrol,some castor oil and some vinegar.

7. What does the underlined sentence "you must do everything as I do" mean in Paragraph 3 ?

   A. Yon should follow me.

   B. You must do everything in the whole process of the experiment.

   C. You should do everything by yourselves.

   D. You should only do something.

8. What did the teacher give to the students in the lesson?

   A. Some knowledge on chemistry.

   B. Some knowledge on experiment.

   C. Instruction in mixing liquids.

   D. Instruction in the right way to learn science.

9. How did Paul think of this teacher?

   A. He disliked the teacher.

   B. He respected and liked the teacher.

   C. He liked the teacher because the teacher looked interesting.

   D. He liked the teacher because he liked chemistry very much.

  It is easier to float in the ocean than it is to float in a swimming pool. Do you know why?

  Ocean water is full of salt,and salt water can hold up more weight than fresh water. See for yourself!You will need：

. 3 cups of warm water

. Measuring cup (跫杯)

. Wide-mouthed jar

. Sail

. Spoon

-Raw (生的) potato 

You will do:

1. Pour 1. 5 cups of warm water into the jar.

2. Add 1/3 cup of salt.

3. Stir (搅拌) until the salt is completely dissolved.

4. Add another 1. 5 cups of water. Pour it slowly over the back of the spoon into the jar so that the two liquids will not mix together. 

5. Gently place the potato into the jar. Donot drop it. What will happen： The potato will sink,but only halfway!

Why： 

  Salt water is heavier than fresh water,so it will stay on the bottom. The fresh water will remain on top.

  The potato is heavier than the fresh water,but it is lighter than the salt water. That is why the potato will sink only halfway down.

1. In the experiment,what should you do right after you pour the water over the spoon?

   A. Add ihe salt to the water.

   B. Stir the salt into the water.

   C. Place the potato in the jar.

   D. Pour warm water into the jar.

2. In Step 4 of the experiment,why do you pour the water over the spoon slowly?

   A. It is easier to see what you are doing.

   B. It pushes the fresh water to the bottom.

   C. It will keep the water from coming out.

   D. It will keep the liquids from mixing together.

3. In which step of the experiment do you add the salt?

   A. Step 1.  B. Step 2. C. Step 3.  D. Step 4.

4. What does the underlined word Gently" mean?

   A. Carefully.

   B. Quickly.

   C. Secretly.

   D. Silently.

5. What is the most important detail about salt water in this text?

   A. You can make it yourself.

   B. You can find it in the ocean.

   C. It is heavier than fresh water.

   D. A potato will sink in it.