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Today, people all over the world are moving out of small villages in the country to go and live in big noisy cities . They are moving from the peaceful hills, mountains, fields, rivers and streams of the countryside to the busy world of streets, buildings, traffic and crowds. This movement from rural areas to urban areas has been going on for over two hundred years. In many countries, the main reason people come to live in towns and cities is work. After one or two large factories have been built in or near a town, people come to find a work, and soon an industrial area begins to grow. There is usually a residential area nearby, where the factory workers can live. The families of these workers need schools, hospitals and shops, so more people come to live in the area to provide these services—and a city grows. In every major city in the world, there is a business district where the big companies have their main offices. In the United States, this area is usually in the city center downtown. It is here that you can see the huge skyscraper office blocks. The people who work here often travel a long way to work each day. Many of them live in the suburbs of the city, far away from the industrial area and the city center. Some suburbs are very pleasant, with nice houses and big gardens. There are usually parks for children to play in and large department stores where you can buy all you need. But what is the future of the big cities? Will they continue to get bigger and bigger? Perhaps not. Some major cities have actually become smaller in the last ten years, and it is quite possible that one day we will see people moving out of the major cities and back into smaller towns and villages. 小题1:We can easily know that the underlined phrase “urban areas” means._____ A.areas of the countryside B.areas of a town or city C.areas near the countryside D.areas near a town or a city 小题2:Why do people move to live in cities or towns? A.Because they can live more comfortable there B.Because they prefer noisy life to peaceful life C.They do so mainly to find work D.They don’t like small villages 小题3:We can infer that this movement from rural areas to urban areas_______. A.has been going on for more than 2,000 years B.will continue in the future C.may not continue in the future D.is sure to stop
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【单选题】下列关于有性生殖和无性生殖的说法中, 不正确的是()
A.
试管婴儿技术通过有性生殖实现
B.
进行无性生殖的植物不能产生生殖细胞
C.
秋海棠的叶繁殖属于无性生殖
D.
草莓匍匐茎上长出新个体属于无性生殖
【单选题】下列有关生物生殖的说法不正确的是 [     ]
A.
植物的组织培养属于无性生殖
B.
昆虫、鸟的生殖属于有性生殖
C.
无性生殖和有性生殖都能维持种族的延续
D.
无性生殖和有性生殖的根本区别是有无生殖细脆的产生
【单选题】–Shall I tell John about the bad news?--No, you ______. I think that will make him sad.
A.
needn’t
B.
wouldn’t
C.
shouldn’t
D.
mustn’t
【单选题】下列关于有性生殖和无性生殖的说法,不正确的是( )
A.
椒草用叶片繁殖新植株属于无性生殖
B.
进行无性生殖生物不能产生生殖细胞
C.
马铃薯块茎繁殖属于无性生殖
D.
草莓匍匐茎上长出新个体属无性生殖
【单选题】下列有关生物的生殖和发育说法中正确的是
A.
嫁接、植物组织培养、试管婴儿、克隆羊均属于无性生殖
B.
鸡卵的卵黄表面中央有一盘状小白点,说明卵已受精
C.
家蚕、蜜蜂、蝗虫的发育都要经历卵→幼虫→蛹→成虫四个时期
D.
青蛙的生殖和幼体发育在水中进行,幼体要经过变态发育才能上陆生活
【单选题】下列关于有性生殖和无性生殖的说法,不正确的是(  )
A.
试管婴儿技术通过有性生殖实现
B.
进行无性生殖的植物不能产生生殖细胞
C.
马铃薯块茎繁殖属于无性生殖
D.
草莓匍匐茎上长出新个体属于无性生殖
【单选题】下列哪一项感染为特异性感染
A.
B.
C.
急性化脓性阑尾炎
D.
急性乳腺炎
E.
破伤风
【单选题】下列关于生物生殖的说法,不正确的是(  )
A.
试管婴儿技术通过有性生殖实现
B.
青蛙为变态发育,受精和幼体发育均在水中进行
C.
利用马铃薯块茎繁殖属于无性生殖
D.
螳螂的发育依次经过卵、幼虫、蛹、成虫四个时期,为不完全变态发育
【单选题】定向爆破多用加强抛掷爆破,故n
A.
>1
B.
<1
C.
=1
D.
>0.75
【单选题】下列哪一项感染为特异性感染
A.
A:疖
B.
B:痈;
C.
C:急性化脓性阑尾炎
D.
D:急性乳腺炎;
E.
E:破伤风
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