According to a study author, when people with a positive emotional style do get a cold, they may think ______. How did the rese

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问题 According to a study author, when people with a positive emotional style do get a cold, they may think ______.
How did the researchers test their volunteers?

选项 A、By giving everyone nasal drops containing either a cold virus or a particular flu virus.
B、By giving everyone a medicine that help lessen the probability of catching cold.
C、By giving everyone an injection boosting immune function.
D、By investigating everyone’s characteristics, interests and hobbies.

答案A

解析 第六段第一句说的就是“研究者给这些志愿者一些含有感冒病毒或某种流感病毒的滴鼻剂”,这正是本题答案。
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