单项选择题

The world（）is made up of matter.

A．in that we live
B．on which we live
C．where we live in
D．we live in

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单项选择题
（）we have finished the course, we shall start doing more revision work.

A．For now
B．Now that
C．Ever since
D．By now
单项选择题
Scientists now know that matter and energy are very closely related to（）

A．oneself
B．themselves
C．each other
D．one another
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