单项选择题

The bags used to hold water are likely to be damaged by ______.

A．mosquito insects
B．a fitted cover
C．a first-flush device
D．sunlight
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单项选择题
Among the freshmen at UCLA ______ thought themselves as Jewish.
A．most
B．93% of those whose parents were both Jewish
C．62% of those only whose father were Jewish
D．15% of those only whose mother were Jewish
单项选择题
People in Bangladesh can use ______ as a safe source of drinking water.
A．ground water
B．rainwater
C．drinking water
D．fresh water
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