2. 外语
  3. When sunlight enters a dark room through the blinds ______. Exhaled cigarette smoke is yellowish because ______.

When sunlight enters a dark room through the blinds ______. Exhaled cigarette smoke is yellowish because ______.

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问题 When sunlight enters a dark room through the blinds ______.
Exhaled cigarette smoke is yellowish because ______.
选项 A、it comes through the mouth
B、it contains nicotine
C、of water vapour in the mouth
D、it is a good diffuse of light
答案C
解析 推导题。文章第四自然段所举例子说明不同水平高度的天空为什么颜色不一样。然后用了一个简单的例子来进行说明即Examine the smoke from…At first the smoke will be…，after it has been inhaled and then puffed out through the mouth，it will be yellowish because it now contains water droplets…此处 because即说明了原因，所给四个选项中只有C符合原句意思，故正确答案应为C。
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大学英语四级

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