________ of the earth is covered by water．

A.
Two three
B.
Two threes
C.
Two third
D.
Two thirds

D
此题是考查分数的用法．分数表达法是分子用基数词，分母用序数词．当分子大于1时，分母的序数词用复数形式．分数常与of短语连用，作主语时其谓语动词的单复数取决于of后的名词．如：About three fifths of the workers are women．

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阅读理解：阅读短文，选择正确答案完成句子或回答所给问题。

　　The size and shape (外型) of your eats show your character (性格) more than any other part of the face. Other parts of the face change shape as we get older, but ears do rat change their shape. They only change in size.

　　Reading people's character from their ears is a very old science. In the past people thought that a person with big ears had a good character. They thought that a person with small ears in nearly white color was dangerous. They also thought that the shape of the ear showed if a person was musical or not. Today, too, many people believe that the size and shape of the ear help you know if a person is musical.

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[　　]

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　　The size and shape of your ears show your character more than any other part of the face. Other parts of the face change shape as we get older, but ears do not change their shape. They only change in size.

　　Reading people's character from their ears is a very old science. In ancient times people thought that a person with big ears had a good and generous (慷慨的) character. They thought that a person with pale (苍白的), small ears was dangerous. They also thought that the shape of the ear showed if a person was musical or not. Today, too many people believe that the size and shape of the ear helps you know if a person is musical.

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[　　]

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________ of the earth is covered by water．