A、 To stay in a very warm room with a lot of people.
B、 To expose oneself to severe weather.
C、 To play outdoors long when it is snowing.
D、 To wait for a bus on a cold and windy day.

【正确答案】 A

【答案解析】解析：从文中可知待在一个人员聚集又很热的屋子里更易感冒。

A、 You"ll catch a cold sooner or later.
B、 You"ve already come down with a cold.
C、 There are viruses hidden in your body.
D、 The room is not warm enough for your health.

【正确答案】 B

【答案解析】解析：从“If you feel a chill when you’re coming down with a cold，you’re already sick．”可推知。

A、 It is generally believed that colds are caused by exposure to cold weather.
B、 Most colds are "caught" by hand contact.
C、 Cold virus will keep alive for several hours once it leaves human body.
D、 Cold virus can spread around only through the air.

【正确答案】 D

【答案解析】解析：文章指出空气传播并不是最普遍的感冒传播方式，最普遍的方式是手的接触。故选D。

A、 Wash our hands frequently.
B、 Never rub our nose or eyes.
C、 Throw away tissues immediately after use.
D、 Shake hands with our friends instead of kissing them.

【正确答案】 A

【答案解析】解析：文章最后指出，勤洗手可以减少感冒病毒的传播机会。

A、 A cold-sufferer is staying with him in the same room.
B、 The viruses have been exposed to the air for over 3 hours.
C、 He dropped in a warm room.
D、 He shakes hands with a cold-sufferer.

【正确答案】 D

【答案解析】解析：从“Numerous studies have now shown that the overwhelming majority of colds are‘caught’byhand contact．”可知手的接触是最易发生的感冒传播途径。