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【简答题】
老师把参与实验的学生分成三个组，对每组学生完成任务的情况给予不同的强化，第一组用口头表扬，第二组用金钱奖励，第三组用加分。在这一研究中，自变量是_____(选择填写：数字变量;类别变量)
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反馈参考答案：
举一反三
【单选题】In the last paragraph, the author tries to justify his conclusion by
A.
reducing to absurdity.
B.
an comparison.
C.
giving an example.
D.
explaining a phenomenon.
【单选题】In the third paragraph, the author tries to demonstrate that our siblings
A.
offer us much useful information.
B.
have great influences on us.
C.
are the ones who love us completely.
D.
accompany us throughout our life.
【单选题】What conclusion can we draw from the passage?
A.
The author tries to tell the readers how important the language is.
B.
The author intends to explain the significance of culture in global communication.
C.
The author thinks his mistake is only an awkwardness in his everyday life.
D.
The author wants to illustrate what the sentence 'Don't use thanks' means.
【单选题】The author tries to convince us that
A.
college education paves the way for future success.
B.
higher education faces an unforeseeable future.
C.
a college diploma is the necessary credential for better jobs.
D.
the purely economic reason for college is not as compelling as it once was.
【单选题】下列关于涡流的说法正确的是
A.
涡流是感应电流，也是因为穿过导体的磁通量变化而产生的
B.
涡流不是感应电流，而是一种有利于感应电流的特殊电流
C.
涡流有热效应，但没有磁效应
D.
在硅钢中不会产生涡流
【简答题】By asking these fundamental questions, the author tries to persuade us to change our view on ________.
【单选题】In the book, the author tries to explain that
A.
money is useless to us.
B.
money is the aim of life.
C.
money should be an instrument.
D.
money is everything.
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