高考英语阅读理解练习题及答案(5)
留学群高考网为大家提供高考英语阅读理解练习题及答案(5),更多高考英语资讯请关注我们网站的更新! 高考英语阅读理解练习题及答案(5) The fiddler crab (蟹) is a living clock. It indicates(=shows) the time of day by the colour of its skin, which is dark by day and pale by night. The crab’s changing colour follows a regular twenty—four hour plan that exactly matches the daily rhythm (节奏) of the sun. Does the crab actually keep time, or does its skin simply answer to the sun’s rays, changing colour according to the amount of light strikes it? To find out, biologists kept crabs in a dark room for two months. Even... [ 查看全文 ]高考英语阅读理解练习题及答案(5)的相关文章