The Earth________three principal layers: the dense, iron-rich core, the mantle made of silicate rocks, and the thin, solid-surfa

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问题 The Earth________three principal layers: the dense, iron-rich core, the mantle made of silicate rocks, and the thin, solid-surface crust.

选项 A、comprises
B、composes
C、consists
D、concedes

答案A

解析 comprise和consist是同义词,但consist之后需跟介词of,而空后没有of,所以只能选A。
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