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12.Losing a baby tooth can be fun for a kid.You can put it under your pillow and look forward to finding some money there in the morning.And then you can watch your new permanent(永恒的) tooth grow in its place.
But if a permanent tooth falls out,that's a problem.There isn't another one under the gum(齿龈) that can replace it.Unfortunately,this happens to some older people.And if permanent teeth fall out or need to be pulled,an older person might need dentures(假牙).
Dentures,known as false teeth,are a set of replacement teeth for any teeth that are missing.There are partial dentures,which take the place of only a few teeth and prevent the others from changing position.If all the teeth are gone,the person would need complete dentures,which replace every tooth in the mouth.
Dentures can cause pains at first and take little time to get adjusted to.They also need special care.They should be brushed daily with a special denture brush and cleanser and soaked(浸泡) in denture solution when not in the mouth.
Dentures are important for the old because,without teeth,it's hard to smile,talk,and eat properly.But it can be a little weird if you see someone take out his or her dentures.It can also be strange to see someone,like a grandparent,without dentures in because he or she won't have any teeth.Try not to make fun of the person because this could cause hurt feelings.
People usually lose their permanent teeth due to periodontal disease(牙周炎),or gum disease,which is caused by bacteria that attacks the gums.Diseased gums aren't strong and healthy,so teeth can get loose and fall out.Older people often have many cavities(洞) that have been filled over the years,and these fillings can weaken over time,leading to more tooth problems.
54.If one of your baby teeth falls out,you.C
A.should have a false tooth fixed in its place  B.have to put it under your pillow at once
C.will gain a permanent tooth in future   D.can exchange it for some money
55.A person wearing dentures.C
A.should brush them with a special denture brush every few days
B.will take a very long time to adjust himself or herself to them
C.will experience unpleasant feelings at the beginning of fixing them
D.should use denture solution to soak them in his or her mouth
56.What does the underlined word"weird"mean in the fifth paragraph?C
A.inconvenientB.excited   C.uncomfortable  D.impolite.

分析 本文是一篇科教类阅读,文章主要介绍了当人的那永恒的牙齿松动的话,就要考虑安假牙了,尤其对老年人来说.其次介绍了假牙的用处,重要性等等.

解答 54-56 CCC
54.C细节理解题.根据第一段You can put it under your pillow and look forward to finding some money there in the morning.And then you can watch your new permanent(永恒的) tooth grow in its place.可知你可以把掉的牙放在枕头下面然后盼望在早上找到一些钱.然后你就可以看到新的永恒的牙会从掉的地方长出来.故选C.
55.C细节理解题.根据第四段should be brushed daily with a special denture brush可知每日都要清洗,故A不正确.根据第四段Dentures can cause pains at first and take little time to get adjusted to.可知需花费很少的时间来适应假牙,故B不正确.根据第四段soaked(浸泡) in denture solution when not in the mouth.可知并不是在嘴里浸泡,故D不正确.根据第四段Dentures can cause pains at first,可知假牙在最初使用时会产生一些痛苦的.故选C.
56.C词汇辨析题.根据第五段But it can be a little weird if you see someone take out his or her dentures.It can also be strange to see someone,可知如果你看见有人取出她的假牙,你可能会觉得有不舒服.由此可知,"weird"的意思是"不舒服的".故选C.

点评 本文考察学生的理解推断能力,抓住文章的关键词,采用寻读的方法查找细节,能根据已知的结果推测导致结果的可能原因.

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