【題目】One-third of the area _____ covered with trees. About seventy percent of the trees _____ been planted recently.
A.is; have
B.is; has
C.are; have
D.are; has

【答案】A
【解析】句意：這個(gè)地方三分之一被樹覆蓋，70%的樹是最近種的。第一個(gè)句子主語是area是不可數(shù)名詞，動(dòng)詞用單數(shù)；第二個(gè)句子主語是trees是可數(shù)名詞，動(dòng)詞用復(fù)數(shù)。故選A。

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