16.It is bad to have food stuck between your teeth for long periods of time.This is because food attracts germs;germs produce acid,and acid hurts your teeth and gums.Flossing(使用牙线) helps to remove the food that gets stuck between your teeth.This explains why flossing helps to keep your mouth healthy,but some doctors say that flossing can also be good for your heart.
It may seem strange that something you do for your teeth can have any effect on your heart.Doctors have come up with a few ideas about how flossing works to keep your heart healthy.One idea is that the germs that hurt your teeth can leave the mouth and travel into your blood.Germs that get into the blood can then attack your heart.Another idea is based on the fact that when there are too many germs in your mouth,the body tries to fight against there germs.For some reason,the way the body fights these mouth germs may end up weakening the heart overtime.
Not every doctor agrees about these ideas.Some doctors think that the link between good flossing habits and good heart health is only a coincidence.The incidence (发生率) of two or more events is completely random,as they do not admit of any reliable cause and effect relationship between them.For example,every time I wash my car,it rains.This does not mean that when I wash my car,I somehow change the weather.This is only a coincidence.Similarly,some doctors think that people who have bad flossing habits just happen to also have heart problems,and people who have good flossing habits just happen to have healthy hearts.
The theory that flossing your teeth helps to keep your heart healthy might not be true.But every doctor agrees that flossing is a great way to keep your teeth healthy.So even if flossing does not help your heart,it is true to help your teeth.This is enough of a reason for everyone to floss their teeth every day.
8.From the passage,we know thatA.
A.food stuck between your teeth may hurt your teeth.
B.all of the doctors agree that flossing is good for your heart.
C.doctors'judgment about flossing is based on medical research.
D.not every doctor thinks flossing helps to keep your teeth healthy.
9.The underlined sentence in Paragraph3is toD.
A.provide an example[
B.make a comparison
C.introduce a new topic
D.develop the previous statement
10.Which of the following best states the main idea of the last paragraph?D
A.It is a fact that flossing can help your heart as well as your teeth.
B.There is no good reason to believe that flossing will help your heart.
C.Because doctors find flossing won't help your heart,it is useless to floss.
D.Even if flossing is only good for your teeth,you should still do it every day.
11.Which is the best title for the passage?C
A.Flossing by Coincidence.
B.How to Keep Your Teeth Healthy
C.Flossing Habits and Healthy Hearts
D.Why Doctors Disagree About Flossing.
分析 本文属于说明文阅读,作者通过这篇文章主要向我们描述了经过研究,剔牙与保持心脏之间没有必然的联系,剔牙能保护牙齿的健康,这是可以肯定的.
解答 8.A.推理判断题.根据第一段提到It is bad to have food stuck between your teeth for long periods of time.This is because food attracts germs(细菌),germs produce acid,and acid hurts your teeth and gums.长时间让食物停留在牙齿是有害处的,这是因为食物能吸引细菌,细菌会产生酸,腐蚀你的牙齿,故选A项.
9.D.句意猜测题.Not every doctor agrees about these ideas不是每个医生都对这些问题持相同的态度,Some doctors think that the link between good flossing habits and good heart health is only a coincidence.一些医生认为用牙线剔牙与心脏健康之间的关系只是偶然Similarly,some doctors think that people who have bad flossing habits just happen to also have heart problems一些医生认为有剔牙习惯的碰巧有心脏问题,故引出以前的观点,因此选D项.
10.D.细节理解题.根据最后一段The theory that flossing your teeth helps to keep your heart healthy might not be true.But every doctor agrees that flossing is a great way to keep your teeth healthy提到剔牙能保持你的心脏健康这一理论是不正确的,但医生同意剔牙能保证牙齿的健康,因此即使剔牙不能有助于你的心脏,肯定能保护你牙齿,这就是每天剔牙的重要原因,故选D项.
11.C.推理判断题.根据第一段Flossing(使用牙线) helps to remove the food that gets stuck between your teeth.This explains why flossing helps to keep your mouth healthy可知本文提到经过研究,剔牙与保持心脏之间没有必然的联系,剔牙能保护牙齿的健康,这是可以肯定的,故选C项.
点评 考察学生的细节理解和推理判断能力,做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确的选择.在做推理判断题不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.