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【单选题】

婴儿爱流口水的原因是( )

A.
看到美味食物起条件反射
B.
婴儿口腔浅，又加上不会及时吞咽口水
C.
肚子饿，想吃食物
D.
婴儿新陈代谢旺盛，唾液腺分泌的唾液较多
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题目标签：流口水
参考答案：
参考解析：
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A.
无条件反射
B.
操作条件反射
C.
内脏操作条件反射
D.
示范作用
E.
经典条件反射
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A.
属于第二信号系统的活动；
B.
无条件反射；
C.
条件反射；
D.
属于第一信号系统的活动
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even if
B.
while
C.
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B.
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C.
肝虚
D.
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B.
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C.
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D.
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A.
四横纹
B.
小横纹
C.
掌小横纹
D.
肾纹
E.
以上均非
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Scan Martinovich couldn"t run around with the other boys in the playground now.
B.
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C.
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A.
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B.
go for
C.
go through
D.
go at
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