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
There are certain ______ when you have to interrupt people who are in the middle of doing something.
A．chances
B．situations
C．occasions
D．opportunities
单项选择题
People in a large area may possess the same DNA thread because ______.
A．DNA is characteristic of a region
B．they are beyond doubt of common ancestry
C．DNA strand has the ability to identify individuals
D．their unique identification can be provided via DNA
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