单项选择题

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[A] When they’re unable to control the person’s behavior. [C] When the consequences of the behavior are unpleasant.
[B] When the causes of the behavior are obvious. [D] when the behavior is expected.
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单项选择题
[A] Lightning-and thunder. C. A great deal of water vapor and a rapidly rising air current.B. Warm air and cold air. D. A great amount of vapor and electricity.
[A] Lightning-and thunder.
C. A great deal of water vapor and a rapidly rising air current.
B. Warm air and cold air.
D. A great amount of vapor and electricity.
单项选择题
A.From the ones they are familiar with to the difficult ones.B.From the short ones to the long ones.C.From the long ones to the short ones.D.From the ones they are confident of to the more difficult ones.
A.From the ones they are familiar with to the difficult ones.
B.From the short ones to the long ones.
C.From the long ones to the short ones.
D.From the ones they are confident of to the more difficult ones.
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