单项选择题

(), the materials expand and contract with the increase and decrease of temperature.

A. It is well known
B. We all know
C. It is well known that
D. As is well known

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单项选择题
What does the boy want to be in the future().

A. A businessman.
B. A lawyer.
C. A professor.
单项选择题
—John, would you lend me some money —Unless you () to pay the money back within six months.

A. understand
B. undertake
C. underplay
D. underline
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