Some geologists are particularly interested in the layers of ______ surface.

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问题 Some geologists are particularly interested in the layers of ______ surface.

选项 A、the earth’s
B、earth’s
C、the earth
D、earth

答案A

解析 表示世界上独一无二的东西的名词,通常要加定冠词,“’s”表示“……的”,故选A。
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