单选题：I can' t tell the __________ difference between the twin si

题目内容：

I can' t tell the __________ difference between the twin sisters. A．slight
B．simple
C．slender
D．single

参考答案：

答案解析：

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The underlined phrase "feed off" in the last paragraph means__________.A．depend

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Aero planes usually do not need to climb quickly or fly high in the polar regio

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More and more young people are held back from teachingA．because of it low pay B．

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