问题 单项选择题

癌性溃疡发生在

A.一种细菌性生物膜,为基质包裹的互相黏附或黏附于牙面等表面的软且未矿化的细菌性群体,不能被水冲去或漱掉,称为
B.牙周正常菌群间或牙周菌群与宿主牙周组织之间的相互作用称
C.位于附着性龈下菌斑的表面,为结构较松散的菌群,直接与龈沟上皮或袋内上皮接触,主要为革兰阴性厌氧菌组成的菌斑称为
D.疏松地附着在牙面、修复体表面、牙石和龈缘处的软而黏的沉积物称为
E.位于龈缘以上,主要分布在近牙龈1/3的牙冠处和其他不易清洁的部位,主要为革兰阳性厌氧菌组成的菌斑称为

答案

参考答案:B

阅读理解

Reading is the key to school success and, like any skill, it takes practice. A child learns to walk by practising until he no longer has to think about how to put one foot in front of the other. A great athlete practises until he can play quickly, accurately, without thinking. Tennis players call that ”being in the zone.” Educators call it “automaticity”.

A child learns to read by sounding out the letters and decoding the words. With practice, he stumbles less and less, reading by the phrase. With automaticity, he doesn’t have to think about decoding the words, so he can concentrate on the meaning of the text.

It can begin as early as first grade. In a recent study of children in Illinois Schools, Alan Rossman of Northwestern University found automatic readers in the first grade who were reading almost three times as fast as the other children and scoring twice as high on comprehension tests. At fifth grade, the automatic readers were reading twice as fast as the others, and still outscoring them on accuracy, comprehension and vocabulary.

“It’s not I.Q. but the amount of time a child spends reading that is the key to automaticity,” according to Rossman. Any child who spends at least 3.5 to 4 hours a week reading books, magazines or newspapers will in all likelihood reach automaticity. At home, where the average child spends 25 hours a week watching television, it can happen by turning off the set just one night in favor of reading.

You can test your child by giving him a paragraph or two to read aloud—something unfamiliar but appropriate to his age. If he reads aloud with expressions, with a sense of the meaning of the sentences, he probably is an automatic reader. If he reads haltingly, one word at a time, without expression or meaning, he needs more practice.

13.The first paragraph tells us            .

A.what automaticity is                    B.how accuracy is acquired

C.how a child learns to walk               D.how an athlete is trained

14.The Illinois study shows that the automatic reader’s high speed         .

A.costs him a lot of work            B.affects his comprehension

C.leads to his future success         D.doesn’t affect his comprehension

15.A bright child         .

A.also needs practice to be an automatic reader

B.always achieves great success in comprehension tests

C.becomes an automatic reader after learning how to read

D.is a born automatic reader

16.The main idea of the passage is           .

A.how to score high on comprehension tests

B.reading is the key to school success

C.how to test your child’s reading ability

D.automaticity is important for efficient reading

单项选择题