先化简，再求比值．5：2.151：6834：562时：45分．

London used to be “foggy” for the same reason that cities like Beijing or Chongqing are “foggy” today．The “fog” was in fact smog, a mixture of smoke and fog．In other words, it was made by air pollution．In London, some of this pollution came from factories, but much of it came from the coal(煤)that people burnt in their houses to keep warm during the winter．By the 1950s, London’s smog problem had become so bad that the government decided to do something to clean the air．A new law was made and nobody could burn coal in any British city．Within a few years, the air became much cleaner．There were no more “pea-soupers”．

Many Chinese cities now face the same sort of problem with air pollution that London faced 40 or 50 years ago．However, this problem is more difficult for Chinese cities to solve．One reason is that more of the pollution comes from the factories, rather than from coal burnt in people’s houses．If these factories were closed, this would harm the economy and lots of people would lose their jobs．Another reason is that changing from coal to cleaner fuel(燃料), like gas, is quite expensive．

However, the air in many Chinese cities is becoming cleaner and cleaner, as the government and people pay more and more attention to cutting down pollution．As a result, there are fewer “pea-soupers”in Beijing than there used to be．

小题1:What was the main reason for air pollution in London?

A．There was too much smoke in the sky．

B．There were too many factories in the city．

C．People burnt too much coal in the houses．

D．The city was too big for the cleaners to clean．小题2:How did the air in London become much cleaner?

A．There was not so much fog in the winter later．

B．A law was made to keep people from burning coal in their houses．

C．Many factories in the city were closed．

D．People paid more attention to cleaning their city．小题3:What does the underlined work “pea-soupers”refer to?

A．Smog

B．Smoke

C．Gas

D．Coal小题4:The problem of air pollution is more difficult for Chinese cities to solve because of ___ reasons．

A．one

B．two

C．three

D．four小题5:Which sentence is Not true?

A．Air pollution is serious in Beijing and Chongqing．

B．Using coal is much more expensive than using gas．

C．Factories made much more pollution in China．

D．The reasons of air pollution in London and Beijing are different．

真空处理有哪些方法？

葛根长于治疗（）

A.外感风热，咽喉疼痛

B.外感风热，寒热往来

C.外感风热，头项强痛

D.外感风热，咳嗽痰多

E.外感风热，胸中烦闷

细菌性肝脓肿的特点是

A．补体结合试验阳性
B．甲胎蛋白阳性
C．右上腹绞痛及黄疸
D．穿刺抽出棕褐色脓液
E．突发寒颤高热，肝区疼痛，肝肿大

南京临时政府成立后，在《临时大总统宣言书》中庄严宣布：“对外要将清政府辱国之举措与排外之心理，务一洗而去之……”；而后在《告各友邦书》中，重申承认清政府和帝国主义国家缔结的一切不平等条约，承担过去的外债和赔款，保护帝国主义在华的各种特权和利益。南京临时政府的这种变化表明其在此期间的主要目的是（）

A.延续帝国主义的中立态度

B.获得帝国主义的外交承认

C.换取帝国主义的经济援助

D.集中力量对付清政府和袁世凯