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
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______ he daydreamed, Peter saw figures in the sky.
A．Until
B．Since
C．While
D．During
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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