单项选择题

The United States Department of Labor (enforces) laws that (promote) the welfare of wage earners, (improving) occupational conditions and (advance) employment opportunities.

A. enforces
B. promote
C. improving
D. advance

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单项选择题

According to the passage, the experience of helplessness causes rats to ______

A．turn off the electricity
B．try to control unpleasant stimuli
C．become abnormally suspicious
D．behave passively in controllable situations

单项选择题

Part Ⅳ ClozeDirections: In this part, there is a passage with 15 blanks. For each blank, there are 4 choices marked A, B, C and D. Choose the best answer for each blank and mark the corresponding letter with a single bar across the square brackets on your machine-scoring ANSWER SHEET.

A．obscure
B．attractive
C．appropriate
D．evident

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