单项选择题

—Is here —No, Bob is ill at home.

A.anybody
B.somebody
C.everybody
D.nobody
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单项选择题
It is on October 1,2009 that the Peoples Republic of China its 60th birthday.
A. congratulated
B.kept
C.remained
D.celebrated
单项选择题
联结学习理论认为,学习就是在刺激和反应之间建立直接联结的过程,其中起重要作用的是()。
A.练习
B.学习
C.强化
D.巩固
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