Basalt, (which )composes (most) of the ocean (floor), is a dark-grey rock (rich

游客2025-02-09 9

问题 Basalt, (which )composes (most) of the ocean (floor), is a dark-grey rock (rich )in iron and magnesium than most surface rocks.

选项 A、which
B、most
C、floor
D、rich

答案 D

解析

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Basalt,(which)composes(most)oftheocean(floor),isadark-greyrock(rich