单项选择题

Advanced mammals such as monkeys, apes and humans have brains （）from ancestors that took to living in the trees.

A. derived
B. progressed
C. terminated
D.advanced

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单项选择题
The flashing red light served as a （）of danger ahead.

A. predictor
B. caution
C. precaution
D. prevention
单项选择题
Ms. Rice, with customary class, simply expressed hope that this episode wouldn’t （）the charity in spite of the previous scandal.

A. taint
B. enhance
C. sprain
D. sponsor
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