单项选择题

Planning our vocation we must take the frequent（）of the weather into consideration.

A. transformation
B. transmission
C. transaction
D. transition

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单项选择题

I will own up to my mistakes. The underlined part means （）

A. correct
B. put the blame on
C. admit
D. make up for

单项选择题

Very few people could understand the lecture the professor delivered because its subject was very ______.

A. obscure
B. indefinite
C. dubious
D. intriguing

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