单项选择题

To their credit the Department of Energy ______ these ideas and funded a detailed study.

A．took over
B．took on
C．took up
D．took to
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单项选择题
Mary will not be able to come to the birthday party as she is ______ with a cold.
A．laid out
B．laid up
C．laid by
D．laid down
单项选择题
______ there is little we can do to modify the weather, we can at least know what kind of weather to expect.
A．Since
B．When
C．While
D．Unless
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