3.Meteorologists forecast the weather _______.

　A.without studying satellite pictures

　B. before they receive satellite pictures

　C. when they have received satellite pictures

　D. after they have compared the new satellite pictures with the earlier ones

2.Why do we use the weather satellites to take pictures of the atmosphere？Because _______.

　A. clouds form there B. the weather forms there

　C. the weather satellites can do it easily D. the pictures can forecast the weather

1.Satellites travel __________.

　A. in space B. above space C. above the ground D. in the atmosphere

4.How many people are going to take cryogenic treatment after they die？

　 a man who died of cancer come back to life in the future if his body is frozen？Why？

3.How do scientists usually keep a dead man's body？

2.Why do they want the world to keep their bodies well？

1.Where do most people hope that their bodies are kept after their death？

　___________________________________

3.According to the passage, a boy of 14 years old sleeps _____.

　A.as long hours as a grown-up

　B.much longer hours than a grown-up

　C.for 14 hours each night

　D.for less than 8 hours each night

2.Whether you have got enough sleep is judged (判断) by _______.

　A.how many hours you have slept B. how many hours you need to sleep

　C. if you do exercise and physical work D. if you feel fresh energetic