2. 外语
  3. The preservation of embryos and juveniles is a______occurrence in the fossil record.

The preservation of embryos and juveniles is a______occurrence in the fossil record.

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问题 The preservation of embryos and juveniles is a______occurrence in the fossil record.
选项 A、scarce
B、lack
C、rare
D、short
答案C
解析 scarce稀少的，不足的，指一般有用而又不足的东西，常用作表语；lack“缺乏的，缺少的，短缺的(of)”；rare“稀少的，稀薄的，极好的，珍奇的”，常用来指罕见而可能是珍贵的东西；short“缺乏的，不足的”，其固定搭配为be short of sth．，主要用来表示缺乏物体、物质等具体的东西。表示缺乏抽象东西时，要用。lack和be lacking in sth．．如The teacher said that the student lacked／was lacking in confidence．
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