单项选择题

A．varies
B．differs
C．alters
D．contrasts
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单项选择题
What will the speakers probably do next
A．Write their lab reports.
B．Find out Professor Smith’s schedule.
C．Interview some high school students.
D．Finish their chemistry experiment.
单项选择题
How did the woman react to Tom’s idea
A．She wonders if she can afford it.
B．She doesn’t want to bother Tom’s roommate.
C．She thinks it won’t work.
D．She thinks it’s a good one.
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