问题 实验题

实验:将水、食油、熔化的蜡烛、洗发精分别装满四个相同的小玻璃杯,放进冰箱的冷冻室内,待它们全部凝固后取出,观察体积的变化。结果发现:只有水结冰后表面向外鼓出来,其余液体降温变成固体后,表面却向内凹进。     

 交流:    

(1)除了     ___   以外,一般的液体凝固后体积都要     ___  。    

(2)物质由液态变为固态时,分子之间的距离要变          _   。   

(3)物质由固态变为液态或由液态变为气态时,体积要变       ______

答案

(1)水;减小

(2)小

(3)大

阅读理解

阅读理解

     Most people have jobs. They go to work nearly every day. Some people are lucky. Either they have very

interesting jobs or they make a lot of money. Most people are not so lucky. Either their jobs are not very

interesting or they don't make a lot of money.

     The most interesting jobs are often the most difficult. People take a long time to learn how to do them.

Doctors study for at least(至少) six years after finishing school. Airline pilots(航天飞行员) study longer.

Most airline pilots are at least 30 years old.

     Some young people have interesting and well-paid(高收入) jobs. Many successful stars are usually under

35. Older people usually cannot play these sports very well. They cannot move fast enough(足够的). Golf,

however, is good sport for older people. Many successful golfers are quite old.

     Most people work until(直到) they are 60 or 65 years old. Then they retire(退休) and have a lot of free time.

Some people never (从不) retire. These people usually have very interesting jobs. Writers, artists, musicians

and actors usually work until they die. Their work is their life.

1.What kind of jobs do lucky people have?

A. Easy jobs with less(很少) money.

B. Not very interesting jobs.

C. Interesting and good jobs with much money.

D. Difficult jobs with less money

2.Why do some jobs take a long time to learn?

A. Because they are difficult.

B. Because they are well-paid

C. Because they are interesting.

D. Because they are easy.

3. Why are young people successful at sports like tennis?

A. Because they can move fast.

B. Because they don't have to study.

C. Because they get paid a lot of money.

D. Because they can't move fast.

4. Who has to(不得不) retire when he is 60?

A. A writer   B. An actor   C.  A policeman     D.  A musician

5. What does the word "die"mean in Chinese?

A. 喜欢

B. 死亡

C. 想

D. 生病

多项选择题