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(使用牙線) 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 (發(fā)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.a(chǎn)ll 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 本文屬于說明文閱讀,作者通過這篇文章主要向我們描述了經(jīng)過研究,剔牙與保持心臟之間沒有必然的聯(lián)系,剔牙能保護(hù)牙齒的健康,這是可以肯定的.
解答 8.A.推理判斷題.根據(jù)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(細(xì)菌),germs produce acid,and acid hurts your teeth and gums.長時間讓食物停留在牙齒是有害處的,這是因?yàn)槭澄锬芪?xì)菌,細(xì)菌會產(chǎn)生酸,腐蝕你的牙齒,故選A項(xiàng).
9.D.句意猜測題.Not every doctor agrees about these ideas不是每個醫(yī)生都對這些問題持相同的態(tài)度,Some doctors think that the link between good flossing habits and good heart health is only a coincidence.一些醫(yī)生認(rèn)為用牙線剔牙與心臟健康之間的關(guān)系只是偶然Similarly,some doctors think that people who have bad flossing habits just happen to also have heart problems一些醫(yī)生認(rèn)為有剔牙習(xí)慣的碰巧有心臟問題,故引出以前的觀點(diǎn),因此選D項(xiàng).
10.D.細(xì)節(jié)理解題.根據(jù)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臟健康這一理論是不正確的,但醫(yī)生同意剔牙能保證牙齒的健康,因此即使剔牙不能有助于你的心臟,肯定能保護(hù)你牙齒,這就是每天剔牙的重要原因,故選D項(xiàng).
11.C.推理判斷題.根據(jù)第一段Flossing(使用牙線) helps to remove the food that gets stuck between your teeth.This explains why flossing helps to keep your mouth healthy可知本文提到經(jīng)過研究,剔牙與保持心臟之間沒有必然的聯(lián)系,剔牙能保護(hù)牙齒的健康,這是可以肯定的,故選C項(xiàng).
點(diǎn)評 考察學(xué)生的細(xì)節(jié)理解和推理判斷能力,做細(xì)節(jié)理解題時一定要找到文章中的原句,和題干進(jìn)行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實(shí),要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷.