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  3. It is bad to have food stuck between your teeth for long periods of time. This is because food attracts germs, germs produce aci

It is bad to have food stuck between your teeth for long periods of time. This is because food attracts germs, germs produce aci

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问题     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 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 be also 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 these germs. For some reason, the way the body fights these mouth germs may end up weakening the heart over time.
    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.     A coincidence is the occurrence of two or more events at one time apparently by mere chance. The incidence of these 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.
    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 sure to help your teeth. This is enough of a reason for everyone to floss their teeth every day.
Using information in Paragraph 3 as a guide, which of the following is the best example of a coincidence?
选项 A、Jim wakes up with a sore throat. He eats a piece of bacon for breakfast. By noon, he feels much better. Jim decides that the bacon has cured his sore throat.
B、Laura remembers to brush her teeth every day, but she only remembers to floss once a week. She writes a note to herself, reminding herself to floss and sticks it to her bathroom mirror.
C、Mario is not very good at baseball.  He practices playing every day. After a several months of practice, he is a much better baseball player.
D、Jai has a bad heart. Her doctor tells her to eat more vegetables and less junk food. After nearly a year of doing this, the doctor tells Jai that her heart is doing much better.
答案A
解析 第三段。作者说，有些医生认为，如果使用牙线的人果真感觉有利于心脏，也许只是偶然的巧合，并举了例子说明什么是巧合。据此，可断定选项A是正确答案。Jim早晨醒来感觉嗓子痛，早餐吃了几片培根，到中午嗓子好多了，他便认为是吃培根的结果。从医学的角度来说显然是不可能的，只是巧合而已。选项B与巧合无关。选项C，Mario经过努力而成为优秀的球员，是因果关系，不是巧合。选项D，遵照医嘱，Jai多吃蔬菜少吃垃圾食品，她的心脏大为好转，也是因果关系，不是巧合。文中说巧合不存在因果关系。
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