在反应之后,如果不继续加以强化,反应行为就会逐渐消失,这种强化原则称为______。
参考答案:强化消退
To compete more effectively with others, it is time that university students _____ to study abroad after
graduation. [ ]
A. tried
B. are trying
C. try
D. will try
句型转换。
1. Li Lei said, "I come from Shanghai." (改为含有宾语从句的复合句)
Li Lei said that _______ from Shanghai.
2. Do you know? When does the train leave? (改为含有宾语从句的复合句)
Do you know_______?
3. One of the two boys must stay here. (改为同义句)
_______ the boys must stay here.
4. Both Lily and Lucy like dancing. (改为同义句)
_______ Lily _______ Lucy _______ dancing.
5. English names are not the same as Chinese names. (改为同义句)
English names are _______ Chinese names.