2. 外语
  3. Every fall, like clockwork, Linda Krentz of Beaverton, Oregon, felt her brain go on strike. "I just couldn’t get going in the

Every fall, like clockwork, Linda Krentz of Beaverton, Oregon, felt her brain go on strike. "I just couldn’t get going in the

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问题     Every fall, like clockwork, Linda Krentz of Beaverton,
Oregon, felt her brain go on strike. "I just couldn’t get going in
the morning," she says. "I’d get depressed and gain 10 pounds
every winter and lose it again in spring. " Then she read about【S1】______
seasonal effective disorder, a form of depression that occurs in【S2】______
the fall and winter, and she saw the light—literally. Every morning【S3】______
now she turns in a specially constructed light box for half an hour【S4】______
and sits in front of it to trick her brain into thinking she’s still
enjoying those long summer days. It seems to work.
    Krentz is not alone. Scientists estimate that 10 million
Americans suffer seasonal depression and 25 million more develop【S5】______
milder versions. But there’s never been definitive proof which【S6】______
treatment with very bright lights makes a difference. In all, it’s hard【S7】______
to do a double-blind test when the subjects can see for themselves
whether or not the light is on. That’s why nobody has ever separated
the real effects of light therapy with placebo(安慰剂)effects.【S8】______
    Until now, in three separate studies published last month,
researchers report not only that light therapy works better than a
placebo and that treatment is usually more effective in the early【S9】______
morning than in the evening. In two of the groups, the placebo
problem was resolved by telling patients what they were comparing【S10】______
light boxes to a new anti-depressant device that emits negatively
charged ions. The third used the timing of light therapy as the
control.
【S1】
选项
答案it—them
解析 代词误用。此处应该使用一个代词来指代上文出现的10 pounds，10 pounds是复数，并且在此处作宾语，故应该使用代词them。
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