(单选题)

The following factors may cause holly blue except ( ).

A.insufficient sleep hours.

B.the added sugars found in holiday sweets.

C.changes of healthy biological clock.

D.reduced sunlight exposure.

参考答案：C

参考解析：

是非题。A项：睡眠不足小时；B项：在糖果中发现的添加糖；C项：健康生物钟的变化；D项：减少阳光照射。ABD项对应第二段These sugary treats, combined with dwindling amounts of sunlight in the wintertime and subsequent sleep pattern variations, can create a "perfect storm" of depression during the holidays.C项无中生有，故本题正确答案选C。

知识点：细节题英语阅读理解通用英语

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