3、下列语句中,正确的是( )
A、无理数都是无限小数 B、无限小数都是无理数
C、带根号的数都是无理数 D、不带根号的数都是无理数
2、的算术平方根为( )
A、4 B、 C、2 D、
1、在实数中,其中无理数的个数为( )
A、1 B、2 C、3 D、4
Here is a large underground computer center.Workers aren't allowed to enter it until they step up to a machine that takes pictures of the tiny blood vessels (脉管) inside their 1 .
If the machine can't 2 the picture with images in its computer, the worker is stopped and caught by 3 .
Each person has a 4 pattern of blood vessels in his or her eye.And 5 a key, the pattern can't be stolen and forged (伪造).
6 keys and locks may soon be things of the past.
Hightech safety devices(装置) are being installed(安装) at military bases,computer centers,nuclear plants and 7 .Companies that make the machines say they'll 8 be used in people's homes and cars.
Already,a Japanese firm has installed devices that 9 people's fingerprints in 260 new homes.The machines open the door only for the 10 of the houses.
The new safety devices are 11 very well because thieves and spies are getting better at 12 buildings and computers that are 13 by locks and keys. 14 no one can steal and forge a fingerprint or eye pattern, the new machines are quite safe.
Another new machine reads voice pattern.Two American companies use voicerecognition machines to 15 their computers.
The 16 voicerecognition machines may someday 17 the locks on cars.The doors would open only for the owners.The device would only cost the owner as 18 as $ 270.
Although the new device are 19 ,scientists must still solve a serious problem.How will a boy borrow his dad's car 20 borrowing his dad's voice?
语篇解读:本文主要介绍了几种新型的身份识别系统,看看你都见过哪种。
1. A.fingers B.hands
C.eyes D.faces
解析:从第3段的in his or her eyes我们判断出本空选eyes。
答案:C
2.A.find B.match
C.fit D.take
解析:这句话要表达的意思是“假如这台机器不能将眼部血管的图像与电脑内的图像
2 ,这位工人会被禁止入内并被捉住。”根据语义的衔接和搭配,选择B。
match“相匹配”,最为恰当。
答案:B
3.A.guards B.police
C.soldiers D.managers
解析:根据上题的分析,在工作地点外最有可能实施抓捕的就是门卫,因此本题选择
A。guards“警卫,门卫”。这句话的意思是“被门卫抓住”。
答案:A
4.A.similar B.same
C.various D.different
解析:此句意思是:每个人眼里都有一种 4 类型的血管。比较4个选项similar“类
似的,相似的”;same“一样的,相同的”;various“各种各样的”;different“不
同的”。结合后面the pattern can't be stolen and forged可判断出此处应选择D。
答案:D
5.A.as B.unlike
C.like D.being
解析:根据本句的后半句the pattern can't be stolen and forged,以及常识钥匙是可以
被偷走或伪造的,可推断出本句的意思是:人们眼睛里的血管的结构不像(unlike)钥匙
一样可能被偷或伪造。因此选B。
答案:B
6.A.Modern B.Home
C.Office D.Oldfashioned
解析:从...be things of the past可看出前半句是说钥匙和锁已经是过时的了,因此选择
D。oldfashioned“过时的,老式的”。
答案:D
7.A.schools B.banks
C.stores D.offices
解析:在这四个选项中,银行(bank)更需要安全装置,也只有银行的重要程度能和军
事基地、电脑中心还有核工厂相提并论。
答案:B
8.A.someday B.possible
C.likely D.sometimes
解析:从语义的衔接来看这里要表示的意思是“将来有一天(someday)这种装置会用于
家庭”。其他几个选项possible“有可能的”;likely“很可能,或许”;
sometimes“不时,有时”,用在此处均不合语境。
答案:A
9.A.print B.save
C.recognize D.store
解析:本句意思为:日本一家公司已经在260户人家中安装了能 9 人指纹的设备。
根据下一句The machines open the door...以及几个备选选项,只有recognize“识
别”,最为恰当。
答案:C
10.A.owners B.buyers
C.sellers D.keepers
解析:根据语义可判断这种机器装置只为房子的主人开门,因此答案为A。
owners“主人”。
答案:A
11.A.sold B.made
C.doing D.selling
解析:后面的because从句是卖得很好的原因,因此应在此空填表示“卖”的意思的
词,产品直接加动词sell,表示一种被动的关系,又因为是进行时,此空应选selling。
答案:D
12.A.breaking B.breaking into
C.stealing into D.stealing
解析:这里要表达的意思是贼和间谍们闯入(breaking into)楼房和计算机的技术越来越
高超,因此人们需要这种装置,此空选择breaking into“闯入,闯进,破门而入”。
break“破坏,打破,打坏”;steal into“偷偷跑进,溜进”;steal“偷,盗窃”。
答案:B
13.A.guarded B.fixed
C.closed D.protected
解析:根据语义判断,这些楼房和计算机应该是被锁和密码保护着的,因此此空选
D。
答案:D
14.A.For B.Since
C.While D.When
解析:从后文的the new machine are quite safe可看出,此句前半部分是原因,因此选
B。for作为连词也能表原因,但是for分句不放在句首,且引导的分句前常有逗号。
答案:B
15.A.keep an eye on B.keep up
C.keep D.keep off
解析:keep an eye on的意思是“注视着”,为固定搭配,相当于guard,用在此处最
为恰当。keep up“维持,继续”;keep“保持”;keep off“让开,不接近”。
答案:A
16.A.old B.expensive
C.interesting D.inexpensive
解析:从后文的only cost看出inexpensive正确。
答案:D
17.A.take the place of B.take place of
C.instead D.use
解析:根据语境可知本句意思是:便宜的声音识别机器将来会代替(take the place of)
汽车上的门锁。因此本题选A。
答案:A
18.A.littl e B.much
C.high D.low
解析:由would only可知该声音识别机器不贵,所以是as little as,如果认为昂贵的话
应用as much as。
答案:A
19.A.useful B.expensive
C.interesting D.different
解析:由although可知逗号前后内容构成对比,逗号后面说科学家还must still solve a
serious problem,由此可推知逗号前面是说“虽然该声音识别机器有用”,因此本空
选useful。
答案:A
20.A.by B.with
C.through D.without
解析:根据语境可知,本空所在句子就是上句提到的a serious problem,要表达“如
果一个男孩没有借他爸爸的声音他又怎么能借他爸爸的车呢?”,因此本空选
without。
答案:D
15.The teacher told the class to their books.
A.put away B.put down
C.put on D.put up
解析:句意:老师告诉同学们把书收起来。put down“镇压,击败,放下”;put
on“穿上”;put up“举起,抬起”。put away“把……收起,放好”,符合题意。
答案:A
14.Don't use words,expressions,or phrases only to people with specific
knowledge.
A.being known B.having been known
C.to be known D.known
解析:考查过去分词作后置定语。句意:不要用那些只有专业人士才认识的单词、词
组或短语。 words,expressions,or phrases应是被知道,因此,应用过去分词known
作后置定语表被动。
答案:D
13.I haven't time to see the movie. ,it's had bad reviews.
A.However B.Besides
C.Therefore D.Apart from
解析:besides“而且,除此之外”。句意:我没有时间看这部电影,而且人们对它的
评价也不高。apart from后应接名词或v.ing形式。
答案:B
12.-Why not join us in playing football?
-I'm afraid not, for I have something important to .
A.turn to B.attend to
C.look on D.take on
解析:考查动词短语意义。turn to“转向”;attend to“处理”;look on“看待”;
take on“呈现,雇佣”。由题意可知B项正确。
答案:B
11.It is widely believed that laughter has effect on physical and mental health.
A.positive B.sensitive
C.energetic D.popular
解析:考查形容词词义辨析。positive “积极的”;sensitive“敏感的”;
energetic“精力充沛的”;popular“流行的,大众的”。由题意可知A项正确。
答案:A
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