A
People throw rubbish on the beach and even into the ocean. The rubbish has become the "home" of hermit crabs (寄居蟹). Believe it or not, it is happening all over the world. Scientists have seen hermit crabs using bottle tops, parts of old light bulbs (灯泡), and even broken glass bottles.
Different from other crabs, hermit crabs have soft bodies, so they need to look for shells for protection. They first look at the shells' type, size, and colour. Then, they use their legs to check the inside of the shells to make sure they are the right size. As they grow, they give up their old shells and find bigger ones to live in.
However, "rubbish shells" can bring danger to hermit crabs. Plastic rubbish is often brighter in colour than shells. It might stand out against the background, so predators (捕食者) can find hermit crabs more easily. Also, the crabs may not get out and then die when they go into plastic bottles or old tires (轮胎).
() 21. What has become a problem according to paragraph 1?
A. There are more hermit crabs than ever.
B. Hermit crabs are using rubbish as homes.
C. People cannot leave rubbish on the beach.
D. Scientists have a problem finding hermit crabs.
() 22. According to the passage, the underlined word "protection" in paragraph 2 means "" in Chinese.
A. 抵抗
B. 保护
C. 觅食
D. 爬行
() 23. How do hermit crabs check the inside size of a shell?
A. They use their legs.
B. They use their eyes to see.
C. They check by the smell.
D. They check by the nearby water flow.
() 24. Why might the writer write this article?
A. To tell interesting stories about hermit crabs.
B. To show the rubbish problem for hermit crabs.
C. To show the importance of having hermit crabs.
D. To have people make new homes for hermit crabs.
() 25. Where can we probably read this passage?
A. In a storybook.
B. In a travel book.
C. In a fashion magazine.
D. In a newspaper.