er --- other animals.
49. A。这是一道考查细节和事实的题目。文章的第三段有这样一句话：When you
have bottles of air on your back, you can stay in deep water for a long time. 背着
空气瓶潜水就是“scuba diving”。
50. D。这是一道考查细节和事实的题目。文章的第四段有这样的叙述：At about
3,000 feet, there is no light at all. It is dark in the sea. Many fishes have no eyes.
在3，000米的深处，一点光线都没有，很多于都没有眼睛，他们怎麽能够通
过“看”来找到路呢？
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