缺词填空:if you want to know something about animals,read some books on these s______.

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缺词填空:if you want to know something about animals,read some books on these s______.
缺词填空:if you want to know something about animals,read some books on these s______.

缺词填空:if you want to know something about animals,read some books on these s______.
应该填shelves(shelf的复数)吧.
a bookshelf 书架
shelf-mark n number marked on a book to show where it should be kept in a library 排架号(图书馆标於书上指示置於书架位置的编号).

subjects 学科,话题,主题

side 方面