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項的含義是地球有4600年，與實際不符，故不選B，故本題選C。
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