A、 People can catch cold if they stay outside in cold weather for a long time.
B、 It is not easy for people to catch cold if they always keep themselves warm.
C、 A chill can cause a cold, not the other way round.
D、 A cold can cause a chill, not the other way round.

【正确答案】 D

【答案解析】解析：根据“it’s the cold that caused the chill，not the other way round”可知D项正确。

A、 The air of a cold-sufferer" s room.
B、 The coughs and sneezes of a cold-sufferer.
C、 A kiss to a cold-sufferer.
D、 A handshake with a cold-sufferer.

【正确答案】 D

【答案解析】解析：文章第二段指出majority of colds是通过和感冒的人hand contact引起的，故D项正确。

A、 One hour.
B、 Two hours.
C、 Three hours.
D、 Four hours.

【正确答案】 D

【答案解析】解析：文中最后一段指出感冒病毒保持传染性可达到three hours，A、B、C三项时间都符合这一条件，故D项为正确答案。

A、 Exposure to severe weather would lead to cold.
B、 When you have caught cold, you would chill.
C、 The virus can spread through droplets into the air.
D、 Frequent hand-washing can prevent from catching cold.

【正确答案】 C

【答案解析】解析：文章指出引起感冒的是viruses hidden in the body，而非A项；chill是感冒的early symp-tom，B项先后顺序不对；文章只是说常洗手可以minimize the spread of viruses，而非完全避免，D项不对；C项为文章原句，故正确。

A、 Cold is not a preventable disease.
B、 What cold brings to us.
C、 The most common way to spread cold.
D、 Steps to avoid catching a cold.

【正确答案】 D

【答案解析】解析：文章讲述了感冒传染的方式和防止感冒的措施，文章首句便点明了主旨，故D项正确。