The earth is       years old.
A.four thousands six hundredsB.four thousand six hundred
C.four thousand and six hundred millionD.four thousand six hundred millions
C
在英文中的數(shù)詞表示具體的數(shù)量不可以使用復(fù)數(shù),故本題不選AD,B項(xiàng)的含義是地球有4600年,與實(shí)際不符,故不選B,故本題選C。
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