Scientists think that there has been life on Earth for _______ years.       
A. millions     
 B. millions of
C. million of
D. million
B

試題分析:此題重點(diǎn)考查數(shù)詞的表達(dá)法,如果有確切的數(shù)字 thousand 或million后面直接跟名詞,thousand 和million等不用復(fù)數(shù),也不用of,而thousands of,millions of直接跟名詞或代詞,前面不用確切的數(shù)字表示約數(shù),根據(jù)題意故選B
點(diǎn)評(píng):正確區(qū)分是確切數(shù)還是不確切數(shù),二者不能混淆,關(guān)鍵是thousand和million加不加s。
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