7.David ________ (visit) many countries and learned several foreign languages since 2000.

6.The animals ________ (keep) in tiny cages and can hardly move at all.

5.They have ________ (筹款) money for the area of the flood disaster.

4.It is said that there are only eight ________ (行星) now.

3.This creature’s _________(生长环境)is the jungle.

2.I think zoos can ___________(提供)homes for many endangered animals.

1.In1972, it was ___________(发现)that they were endangered .

5.　What caused the “London Killer fog” of 1952?　 ___________________

A. It rained for a long time.　　　　　　　

B. It didn’t rain for a long time.

C. A warm air covered southern England with the freezing-cold air below.

D. The traffic stopped.

4.　In this passage the underlined word “humidity” means_______.

A.　温度　　　　 B.　降水　　 C. 风速　　　 D. 气压

3.　How long did the “London Killer fog” last?　 _____________.

A.　About one month　　　　　　　　　　　　 　B.　About two weeks

C.　About five days　　　　　　　　　　　　　　 D.　About half a month