Glaciers, (mass) of ice that flow (outward) from ice caps, cover (about) one-tenth of earth’s (land) area.

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问题 Glaciers, (mass) of ice that flow (outward) from ice caps, cover (about) one-tenth of earth’s (land) area.

选项 A、mass
B、outward
C、about
D、land

答案A

解析
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