四、阅读理解。(共20小题;每小题2分，满分40分)

(A)

Skin-diving(潜水)is a new sport today . This sport takes you into a wonderful new world . It is like a visit to the moon ! When you are under water , it is easy for you to climb big rocks , because you are no longer heavy .

Here, under water, everything is blue and green. During the day, there is enough light. When fish swim nearby, you can catch them with your hands.

When you have tanks of air on your back, you can stay in deep water for a long time. But you must be careful when you dive in deep water.

To catch fish is one of the most interesting parts of this sport. Besides(另外) , there are many uses for skin-diving . You can clean ships without taking them out of the water. You can get many things from the deep sea.

Now you see that skin-diving is both useful and interesting.

(    )1. Skin-diving will take you to           .

A. the moon            B. mountains           C. danger         D. the deep sea

(    )2. You can climb big rocks under water because           .

A. You are stronger                 B. the fish nearby help you.

C. You are lighter than on land .       D. there is a lot of fish.

(    )3. Under water , a skin-diver           in the daytime.

A. can see everything clearly          B. can’t see anything clearly.

C. can see nothing                  D. can see only fishes.

(    )4. With a tank of air on your back , you can           .

A. catch fish very easily.             B. stay under water for a long time.

C. drink some clean water              D. have more fun.