2. 外语
  3. In the experiment on rats, a fragrant flavor was added to the rat’s drinking water to ______. The expression "the habit" (parag

In the experiment on rats, a fragrant flavor was added to the rat’s drinking water to ______. The expression "the habit" (parag

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问题 In the experiment on rats, a fragrant flavor was added to the rat’s drinking water to ______.
The expression "the habit" (paragraph 1, sentence 4) refers to drinking water which ______.
选项 A、has no smell
B、is tasteless
C、has vitamins
D、is flavored
答案D
解析 第一段的最后谈到：“当把香味加到含维生素的液体中时，老鼠便仿佛嗅到了香味并持续喝加了香味的水，即使是维生素转而加到了清水里面也如此。然而，很快，它们就改变了这个习惯，重新开始喝含必需的维生素的水了。”文中的habit实际上指喝有香味的水。所以D是正确答案。
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