通读下面短文，掌握其大意，然后在各小题所给的四个选项中, 选出一个最佳答案。

Many of us may know that bats (蝙蝠)can't see. Do you know how bats find their1? In fact bats "see" with their ears. Most bats make a sound(声音) when they2. And the echoes(回声)of the sound come back to their3. In this way, they know their ways4.

We can only see bats at night5 they just come out in the evening. In the daytime, they stay at their homes.

When the evening comes, they begin to go out and look for6They like to昆虫 eat fruit and insects. In the7, they go homes and sleep until the evening comes. Many people don't like bats because they think bats are8 animals. In fact, they are very9because they can help people do a lot of things. So, we should10them. They are our good friends.