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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The speaker,（）for her splendid speeches, was warmly received by the audience.

A. having known
B. being known
C. knowing
D. known
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
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