关于条件反射的叙述正确的是
A.通过后天学习和训练而形成
B.不需要非条件反射为基础
C.数量有限且比较固定
D.属低级的反射活动
E.主要中枢部位在脑干
参考答案:A
—Can you sing the song _____ English?
—Yes, I can. [ ]
A. with
B. for
C. to
D. in
In the video of US Gulf incident, a person replied in _______ seemed to be an American accent: “This is coalition warship.”
A.which
B.what
C.that
D.where