评论：阅读理解 Dog owners now have a little help understanding their furry friends. A new device called Bow

内容简介：阅读理解:阅读下列短文, 从所给的四个选项中, 选出最佳答案。 Animals seem to have the sense to eat when they are hungry and　　 they do not eat more than their bodies need. It has been demonstrated　　 (证实) that rats will, when...

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