with a tank of air on your back ,you canSkin-diving（轻装潜水）is a new sport today. This sport takes you into a wonderful world. It is like a visit to the moon. When you 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 much light. When fish swim nearly, you can catch them with your hands. When you have tanks of air on your back you can stay in de
with a tank of air on your back ,you can
Skin-diving（轻装潜水）is a new sport today. This sport takes you into a wonderful world. It is like a visit to the moon. When you 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 much light. When fish swim nearly, 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, there are more uses for skin-diving. You can clean ships without taking them out of water. You can get many things from the deep water.
Now you see skin-diving is both useful and interesting.
With a tank of air on your back, you can __________.
A. catch fish easily
B. stay under water for a long time
C. climb big rocks
D. have more fun
为什么选择D，不是B
其实这个很好理解的
首先，选项ABC都只是单一的列举了潜水到更深处的乐趣或者作用，例如
A：更简单的抓到鱼（乐趣）
B:在水底呆的更久。（作用）
C:攀登大的岩石。（乐趣）
D:享受更多的乐趣 （一句话概括全部）
而D是总得概括这一活动的目的，不管是抓鱼，还是可以在水底呆的更久，或者其他的好处，都是可以让这个活动显得更有趣。故选D。
这是。。。。。
我觉得是因为stay in deep water和stay under water,不是完全相同的意思.一个是强调在深水里停留,另一个只是说在水下,没有具体表明深浅.第四个选项have more fun,虽然一下无法能找到直接的语句,但是从后两段中“To c...