题目内容

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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