单项选择题


A．She has changed her schedule.
B．She works less than she used to.
C．She is going to ask for a leave on Wednesday.
D．She is going to have her vacation on Tuesday.
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单项选择题
What can we infer from the passage
A．Valley glaciers flow downhill from mountains and are shaped by the topography.
B．Ice sheets move faster than valley glaciers.
C．Valley glaciers are as old as ice sheets.
D．It takes different time for glaciers to form in different places.
单项选择题
The author mentions the children’s behavior in the last paragraph to______.
A．improve the effectiveness of rewards
B．explain what is behaviorism
C．show rewards may not achieve the expected purpose
D．provide evidence to rewarding system
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