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47．Widespread wage reductions were imposed during the recession of 1906～ 1909 and price inflation thereafter impeded the recovery of real wage levels.

A．convoluted      B．belied           C．encumbered      D．stoked

48．Helplessly she blinked up at him, feeling a slow lethargy creep through her whole body.

A．provision        B．cylinder         C．contradiction     D．exhaustion

49．The attack was meticulously planned and executed.

A．negligently      B．slovenly         C．fussily          D．discreetly

50．At the same time, medical and social science research began to indicate that retirement itself had detrimental effects.

A．damaging       B．magnificent      C．useful           D．relevant

51．The batteries can be recharged when they run ______.

A．over            B．down           C．out             D．a(chǎn)long

52．The rioters headed downtown, ______ they attacked city hall.

A．since           B．a(chǎn)s              C．whereupon      D．yet

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