Hares might be able to adapt over time. Some snowshoe hares in Washington State don't turn white at all. Mills is trying to figure out whether hares and other wildlife can adapt as fast as the climate is changing.

　　“But how fast is too fast？” he asks.

　　21．Alex Kumar and his classmates catch snowshoe hares in order to find out ________.

　　A．the hares' natural enemies

　　B．how the ecosystem in the woods works

　　C．why the hares change fur colors regularly

　　D．the influence of climate change on the hares' lives

　　22．The word “camouflage”(Paragraph 6) is closest in meaning to ________.

　　A．fighting

　　B．escaping

　　C．hiding

　　D．scaring

　　23．According to the passage, snowshoe hares can now be easily discovered by their enemies because they ________.

　　A．change their fur color to white too late

　　B．find it more and more difficult to molt at the same time each year

　　C．can no longer adapt to the change of light in spring and fall

　　D．haven't adapted to climate change

　　24．Which best describes Mills' tone in the passage?

　　A．Approving.

　　B．Doubtful.

　　C．Enthusiastic.

　　D．Concerned.

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