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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
在英文中的数词表示具体的数量不可以使用复数,故本题不选AD,B项的含义是地球有4600年,与实际不符,故不选B,故本题选C。
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