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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