应激源是指让个体产生应激反应的各种各样来自外界和内部的情形。
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恐惧能引起个体逃避恐惧物的行为,因此利用恐惧来设计广告不是有效的方法。
A. 对
B. 错
The old man (transfer) ____all his property to his grandson.
I drew a map to (able) ____him to find the house.
The (attract) ____of the moon to the earth causes the tide (潮汐) to rise and fall.