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题目

The _____ surrounding the egg has many important functions.A. coverB. layerC. shellD. firm

The _____ surrounding the egg has many important functions.

A. cover

B. layer

C. shell

D. firm

题目解答

答案

C. shell

解析

本题考查对词汇的理解和运用，解题思路是分析每个选项单词的含义，结合句子语境来判断哪个选项最符合。

A选项“cover”：作名词时，意为“封面；盖子”。“egg”（鸡蛋）一般不会用“封面”或“盖子”来描述其周围的结构，所以A选项不符合句子语境。
B选项“layer”：意为“层；层次”，它是一个比较宽泛的概念，没有明确指出鸡蛋周围具体是什么结构，相比之下不够准确，所以B选项不合适。
C选项“shell”：意思是“壳；外壳”，鸡蛋外面有一层壳，“egg shell”（蛋壳）是常见的表达，该选项符合句子描述鸡蛋周围结构的语境。
D选项“firm”：作名词时，意为“商行；商号”，与鸡蛋周围的结构毫无关系，所以D选项不正确。

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