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【单选题】
下列关于条件反射描述正确的是( )A.
条件反射是后天建立的，与非条件反射无关。
B.
把无关刺激转变为条件刺激的过程称为强化
C.
“望梅止渴”的现象是人类特有的
D.
条件反射一旦建立则永远无法消退
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反馈参考答案：
举一反三
【简答题】常用的抗惊厥药是( )、( )、( )。
【简答题】Can you list several kinds of meals served on an airplane? How does the cabin crew serve food to passengers?
【单选题】The airplane meals should go through many procedures,which need () hours.
A.
7
B.
8
C.
9
D.
10
【单选题】The airplane will use 20 percent less fuel for comparable missions than today's similarly sized airplane. It is expected that advances in engine technology will contribute as much as 8 percent of the ...
A.
the 787 use more fuel than the similarly sized airplane
B.
the 787 use less fuel than the similarly sized airplane
C.
the 787 use less fuel because it's a new one
D.
the 787 has a nearly two-generation jump in techonogy than Airbus newest airplane
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