造成离心机盐浆管堵塞的原因有哪些？

“共争青岛归还，同看国贼罢黜。欢呼学生复课，庆贺商店开门。”这幅对联反映的史实出现的最主要原因是[ ]

A．全国人民的支持

B．党的正确领导

C．青年学生的斗争

D．无产阶级的参与

In Singapore，most of us love window-shopping while some others enjoy having a picnic at East Coast Park or Changi Beach on sunny days．Singaporeans are never bothered by the occasional thunderstorm．However，we know that if it rains for long continuous periods，there will be more serious effects．Just recently the main shopping street of Orchard Road was flooded and some part of Bukit Timah was impassable(不能通行的)to traffic．People reacted by writing in to the newspaper to complain about this! We forget that other countries suffer much worse effects.

Elsewhere，heavy tropical(热带的)storms often result in floods that ruin crops especially in Thailand and Malaysia．This in turn usually means that the price of rice and vegetables here in Singapore will rise because we import these products from them．If there is a typhoon or tsunami，thousands of lives are lost too．This happened in Indonesia and Phuket in Thailand in 2004 and It serves to remind us of how Mother Nature can cause great damage．

Weather patterns in general have changed dramatically in recent years．Scientists believe that global warming and the resulting melting of the polar ice-cap has caused the level of the ocean to rise．This in turn causes flooding of low-lying areas in countries where the land is rather flat and some parts of which is below water level．It is believed that human activities have caused Mother Nature to show her extreme anger，so it is now important that we really work together to cut down on harmful activities，for example，illegal logging(伐木)or irresponsible forest-burning to clear land for farming．

小题1:From Paragraph 1，we can see that most Singaporeans love ．

A．making complaints

B．going out for picnics

C．doing window-shopping

D．traveling along the coast小题2:What will happen in Singapore if there are floods in its neighboring countries?

A．Heavy tropical storms will follow shortly．

B．The price of rice and vegetables will go up．

C．Many people will write in to the newspaper．

D．More rice and vegetables will be imported．小题3:The underlined word“it”in Paragraph 2 refers to ．

A．the arrival of heavy tropical storms

B．the import of rice and vegetables

C．the rising price of rice and vegetables

D．the loss of lives in natural disasters小题4:What’s the right order of the following events?

a．global warming    b．the rise in ocean level

c．harmful human activities d．the flooding of low-lying areas

e．the melting of the polar ice-cap

A．c→a→e→b→d

B．a→c→e→b→d

C．c→a→b→e→d

D．d→a→c→b→e小题5:What should we do in order not to make Mother Nature angry?

A．Clear more land for farming．

B．Reduce harmful human activities．

C．Bring down the price of food．

D．Improve the quality of weather．

精馏出的馏分是纯净物。

胰腺癌最好发的部位是（）

A.胰腺头部

B.胰腺体部

C.胰腺尾部

D.全胰腺

E.异位胰腺

婴幼儿哮喘诊断中错误的为（）

A.反复咳喘3次或以上

B.婴幼儿哮喘评分小于5分可作出诊断

C.家族哮喘史阳性

D.喘息呈突然发作

E.年龄小于3岁