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
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单项选择题
The American professor came to realize that he had underestimated the ______ of most of the Chinese students.
A．magnitude
B．gradient
C．potential
D．firmness
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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