单项选择题

The () of the word is unknown, but it is certainly not from Greek.

A. origin
B. generation
C. descent
D. cause

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单项选择题
Annie Jump Cannon,______discovered so many stars that she was called the census taker of the sky .
A. a leading astronomer,
B. who, as a leading astronomer,
C. was a leading astronomer,
D. a leading astronomer who
单项选择题
Every good story is carefully ______ ; the elements of the story reduced to fit with one another in order to make an effect on the reader.
A．emphasized
B．selected
C．planned
D．examined
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