【題目】About seventy percent of our earth _______ by water.

A. is covering B. is covered

C. are covered D. are covering

【答案】B

【解析】試題分析:句意:地球上大約百分之七十被水覆蓋。此題考查主謂一致,地球?yàn)橐粋(gè)整體,百分?jǐn)?shù)的謂語跟它所修飾的名詞,所以為單數(shù);be covered with被覆蓋。根據(jù)句意,應(yīng)選B。

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