问题 填空题

随着工业生产的发展和人类生活水平的提高,每年都有大量的二氧化碳进入大气,造成温室效应.根据所学知识和了解的信息,回答:

(1)地表气温将______(填“上升”或“下降”);

(2)农业上作物产量将______(填“增产”或“减产”);

(3)一些富饶的土地将______(填“得到保护”或“沙漠化”),海平面将______;

(4)为了保护赖以生存的地球,防止温室效应进一步发展的主要措施有______.

答案

随着工业生产的发展和人类生活水平的提高,煤、石油、天然气等矿物燃料的需求量不断增大,它们燃烧后放出大量二氧化碳气体,加之人为的乱砍滥伐,能吸收二氧化碳的大片森林不断消失.因此,每年都有大量的二氧化碳进入大气、大气中二氧化碳含量增大.在地球地大气层中,二氧化碳等气体像温室的玻璃那样起保温作用,导致大气温度不断升高,这就是所谓的“温室效应”.

由于温度持续上升,会使更多的水蒸气进入大气,加速了土地的沙漠化;又由于温度上升,极地冰雪将融化,造成海平面上升,淹没沿海地区.因此,“温室效应”给人类赖以生存的地球造成极大的破坏.

所以“温室效应”会导致:(1)地表气温将上升;

(2)农业上作物产量将减产;

(3)一些富饶的土地将沙漠化;海平面将上升;

(4)为了保护赖以生存的地球,防止温室效应进一步发展的主要措施有植树造林.

故答案为:(1)上升;(2)减产;(3)沙漠化;上升;(4)植树造林.

阅读理解

Always forgetting your long passwords(密码)? Worried about being hacked(被攻击)?All these worries will soon become history. Scientists have found that upper-casing(大写)your password can help you reduce the chance being hacked.

Usually passwords are six letters or more.However,50 percent of people choose a common word or simple key combination for their password. The most used passwords are 123456, abcdef and abc123. In fact, if your passwords are in lower-case(小写),it will be easily hacked by a hacker. According to a study, it only takes a hacker ten minutes to hack a six-letter password which is in lower-case, but if you make the letter in upper-case, it can take up to ten hours. So if you want to make your account much safer, you should make your password upper-case. Of course, you can also add numbers or symbols to your password. Most of the time a hacker’s computer has to work for 18 days to break a password, but if you choose a nine-letter password that includes numbers and symbols, it can take a hacher’s  computer 44,530 years to break it.

小题1:Scientists have found that   your password is much safer for  

your account.

A.upper-casing

B.lower-casing

C.reducing

D.copying小题2:According to the passage,______is not one of the most used

passwords.

A.123456

B.abcdef

C.abc123

D.000000小题3:It takes a hacker___to hack a six-letter password which is in

lower—case.

A.10 minutes

B.10 hours

C.18 days

D.44,530 years小题4:The Chinese meaning of the underlined word is       

A.数字     B.符号      C.色彩       调料

小题5:What is the main idea of the passage?

A.What passwords are.

B.How a password is hacked.

C.How to make your password much safer.

D.Why hackers hack your password.

单项选择题