单项选择题

Without a sure supply of water, fanning in that area remains at the ______ of the weather.

A．disposal
B．risk
C．cost
D．mercy
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单项选择题
All of us did quite a good job but the teacher only ______ him out for praise.
A．yelled
B．singled
C．selected
D．pulled
单项选择题
Which of the following CANNOT be inferred from the passage
A．We are a walking, living, breathing record of our ancestors.
B．Many American slaves did not know who their ancestors were.
C．An adopted child generally lacks enough information to prove his identity.
D．Molecular genealogy can be used to prove a relationship between individuals.
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