单项选择题

A．The air quality is not as serious as the woman says.
B．The air pollution is due to the industrial development.
C．There were no factories here before.
D．They should move to another city.
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单项选择题
What is the probable cause of Krentz’’s problem
A．An unexpected gain in body weight.
B．Unexplained impairment of her nervous system.
C．Weakening of her eyesight with the setting in of winter.
D．Poor adjustment of her body clock to seasonal changes.
单项选择题
What is the CURRENT view concerning the treatment of seasonal depression with bright lights
A．Its effect remains to be seen.
B．It serves as a kind of placebo.
C．It proves to be an effective therapy.
D．It hardly produces any effects.
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