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【简答题】
在操作条件作用中，强化物出现在反应之前，并引起反应。
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举一反三
【简答题】Long conversation two Questions 12 to 15 are based on the conversation you have just heard. 12. A)She is shy when speaking in front of people B)She forgot to prepare the class C)She made a serious mis...
【简答题】下列各项适用于一切社会形态的历史唯物主义原理不包括？
【单选题】听力原文：W: I am sorry I forgot to return your history book last night. M: It doesn't matter because the test isn't coming until Monday. Q: What does the man imply? (13)
A.
It is not too [ate for the man to return the hook.
B.
The man should have returned the book earlier.
C.
She will probably won't do well on the coming Monday's test.
D.
The man should have been more thoughtful.
【简答题】13) She forgot to ____________ the letter into the envelope.
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