Traditional economic models found it hard to explain the phenomenon of .
A. search frictions
B. unemployment
C. labor as commodity
D. wage falls
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通点火开关，拉起驻车制动器手柄时，仪表板上的驻车制动灯应______，放松驻车制动器手柄时，该灯应______。
发动机检修以后一般在实验台上进行______和______。
By "the horse is already out of the barn"(Line 3,Paragraph 3)the author means______.
A. it is too late to do anything
B. we are at a total loss
C. the result is unpredictable
D. people"s lives may be threatened
Which of the following is TRUE of MCI？
A. It may lead to sharp decline in thinking.
B. It relates to Alzheimer"s disease in some way.
C. It is the earliest sign of chronic distress.
D. It can be a result of longtime stress.
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