We know that about seventy percent _____ the earth _____ covered by water.
A．/; isB．of; are
C．of; isD．a(chǎn)bout; are
C

試題分析：句意：我們都知道70%的土地都被水覆蓋。百分?jǐn)?shù)+名詞做主語，謂語動詞的選擇要根據(jù)這個名詞而定。本題中earth是不可數(shù)名詞，因此謂語動詞要用單數(shù)。故選C。
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