Question

【题目】

Bad breath can be a major problem. The good news is that it can often be prevented with some simple steps.

Bad breath is caused by certain bacteria that grow in the mouth. When you don't brush regularly, bacteria accumulate in your mouth and between your teeth. 【1】 Certain foods, especially ones like garlic and onions that contain pungent (辛辣的）oils, can contribute to bad breath because the oils are carried to your lungs and out through your mouth. 【2】 Some people think that as long as you brush your teeth, you shouldn't have bad breath. 【3】 That, however, just doesn't remove the smell. To sufficiently clean all the surfaces of your teeth, you should brush for at least 2 minutes at least twice a day.

Many people believe that if you breathe into your hand, you'll know when you have bad breath. But it’s wrong! 【4】 When you talk, you tend to bring out the smell from the back of your mouth (where bad breath starts), which simply breathing doesn't do. Also, because we tend to get used to our own smells, it's hard for a person to tell if he or she has bad breath.

If you’re concerned about bad breath, make sure you’re taking care of your teeth and mouth properly. If you brush properly and visit your dentist for regular cleanings but your bad breath persists, you may have a medical problem. 【5】 They can figure out if something else is behind your bad breath and help you take care of it.

A. These bacteria make your breath smell.

B. In that case, call your doctor or dentist.

C. Smoking is also a major cause of bad breath.

D. Remember to brush your tongue, too — bacteria love to hang out there.

E. The truth is that most people only brush their teeth for 30 to 45 seconds.

F. When you breathe, the smell bounced back by your hand can be easily sensed.

G. When you breathe, you don^ use your throat the same way you do when you talk.

Answer 1

【答案】

【1】A

【2】C

【3】E

【4】G

【5】B

【解析】

试题分析：很多人都患有口臭，文章中分析了人们患口臭的具体原因。

【1】A 本段第一句“Bad breath is caused by certain bacteria that grow in the mouth.”告诉我们口臭通常是由于口腔里的细菌导致的。积累在口腔里的细菌会让我们的口气很臭。故A项符合上下文串联。

【2】C 本段正是解释导致口臭的几个原因，横线前句告诉我们大蒜和一些辛辣的食物会引起我们的口臭。本句也应该是告诉我们口臭的原因。故C项“Smoking is also a major cause of bad breath.吸烟也是口臭的一个主要原因”符合段落大意。

【3】E 根据本段最后一句To sufficiently clean all the surfaces of your teeth, you should brush for at least 2 minutes at least twice a day可知要想真正地清洁牙齿，我们每天至少要刷2次牙，一次至少2分钟。那么很多人口臭的原因就在于刷牙的时间不够。故E项“The truth is that most people only brush their teeth for 30 to 45 seconds.”符合上下文串联。

【4】G 根据横线后句When you talk, you tend to bring out the smell from the back of your mouth (where bad breath starts), which simply breathing doesn't do.可知人们说话和人们呼吸时所使用的器官是不一样的。所以对着手吹气并不能判断出是否口臭。故G项“When you breathe, you don^ use your throat the same way you do when you talk.”符合上下文串联。

【5】B 根据前句“......you may have a medical problem”可知你经常刷牙，但仍然有口臭。这说明你可能有健康方面的问题，那么你就要咨询医生。故B项符合上下文串联。