人的行为过程包含了三类基本变量，即刺激变量、机体变量和反应变量。对应到人的一般行为规律，刺激属于机体变量，个体的需要、动机与行为则属于反应变量。
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How to call the waiter over in a restaurant?
A. Waiter./Waitress.
B. Excuse me.
Choose the right table manners.
A. Start with the knife, fork or spoon that is nearest from your plate.
B. Start with the knife, fork or spoon that is farthest from your plate.
______ matters is to have a conversation with guests.
A. Which
B. That
C. What
A simple rule to remember is ______ liquids are to the right and solids are to the left.
A. which
B. that
C. what
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