About seventy percent of our earth _______ by water.

A. is covering B. is covered

C. are covered D. are covering

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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