题目内容
We can never expect bluer sky unless we create less polluted world.
A.a; a B.a; the C.the; a D.the; the
A
【解析】
试题分析:考查冠词。不定冠词a用于单数可数名词前,表示泛指,具有“一个”的意思。定冠词the用于各类名词前,表示特指,具有“这,那”的意思。第一空sky是指表示独一无二的事物的名词,由形容词修饰时可用不定冠词,a bluer sky一个更蓝的天空;第二空是不定冠词a用于单数可数名词前,表示(非特指的)一个。句意是我们永远不要盼望看到一个更蓝的天空,除非我们能创造一个较少污染的世界。故选A。
考点:考查冠词。
点评:冠词的选择关键是看所限定的名词是什么性质,泛指用a,特指用the。还有冠词的特殊用法也要掌握。本题第一空就是不定冠词的一个特殊用法。
The skin which covers the tips of the fingers and thumbs is crossed by numerous ridges (隆起) arranged in different patterns. These patterns are permanent from birth and remain exactly the same throughout a person's life, even when the skin becomes wrinkled and cracked as a result of old age. Such patterns are never passed on from parents to children, and no one in the world has the same patterns as anyone else. Even identical twins have different sets of fingerprints. As a result, fingerprints offer a most useful and foolproof way of identifying people. Any ridged part of the hand and the foot may be used as a means of identification, but finger impressions are usually preferred since they can be taken easily and quickly.
Fingerprints are classified in the ways: by general shapes and contours(轮廓), by the finger positions of the pattern-types, and by size (often measured by counting the ridges in the loops). Every set of fingerprints has different “ridge characteristics” (i. e. the print of each separate finger is different from that of all the other fingers), which belong to one of four basic groups: arches, loops, whorls and composites. All fingerprints can then be divided into 1, 024 groups. By using details in the patterns above, these 1, 024 groups can be further divided into thousands of smaller groups, thus making it possible to find a particular set of fingerprints in a few minutes.
【小题1】According to this passage, the true statement about human fingerprints is that ____.
| A.people's fingerprints sometimes can be passed on from parents to children |
| B.people’s fingerprints are unique but identical twins may have the same fingerprints |
| C.using fingerprints is the only way to identify people |
| D.people's fingerprints will not change in all their lives |
| A.we can never find the same set of fingerprints among human beings |
| B.finger impressions can be taken easily and quickly |
| C.fingerprints offer a most useful and foolproof way of identifying people |
| D.all of the above |
| A.that is permanent | B.that is acceptable |
| C.that can not go wrong | D.that is not foolish |
| A.Fingerprints can be classified in three ways |
| B.All fingerprints can be divided into 1, 024 groups and can not be divided further |
| C.It is not easy to find a particular set of fingerprints in a short time |
| D.People can not classify the fingerprints in an effective way |