一个学会了的反应的重复将增加刺激与反应之间的联结，这是（）
A. 练习律
B. 准备律
C. 效果律
D. 分配率
If you have been in this club for half a year, can you dive？
A. Yes.
B. No.
C. Doesn't say.
The United States has pledged 36,000,000 dollars to the United Nations Emergency Fund for
A. China
B. India
C. Iraq
The readers can learn from the last paragraph that the villagers built a fence ______.
A. to show the king the way to their farmland
B. because their farmland had been ruined by their king
C. because their king often walked on their farmland
D. to prevent their king from turning their farmland into roads
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