题目内容

A.withB.toC.forD.by

A. with
B. to
C. for
D. by

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It is proved that the Sun is divided into five layers.

A. Right
B. Wrong
C. Not mentioned

The Sun's atmosphere only exists in the first three zones.

A. Right
B. Wrong
C. Not mentioned

收缩压与舒张压之差为E.

商业折扣是为了鼓励客户尽早付款而给予的优惠。 ()

A. 正确
B. 错误

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