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【单选题】
根据经典条件反射作用理论,铃声可以诱发狗的唾液分泌反应,则铃声可以称为A.
条件 刺激
B.
无条件刺激
C.
条件反应
D.
无条件反应
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反馈参考答案：
举一反三
【简答题】The research effort has __________ on tracing the effects of growing levels of five compounds.
【单选题】Which stage of the product life cycle does rapidly rising sales, very high profit levels, and a growing number of competitors characterize?
A.
growth
B.
maturity
C.
saturation
D.
decline
【单选题】Growing levels of pollution represent a serious health ________ to the local population.
A.
haze
B.
hazard
C.
problem
D.
security
【单选题】There is growing public ________ over levels of air pollution in our cities.
A.
anxiety
B.
concern
C.
worry
D.
fear
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