肝素的抗凝原理是（） A.加强AT-Ⅲ灭活效应 B.与血液中钙离子形成螫合物 C.除

Many people love going on a trip by plane, because planes are fast. But an airport(机场) is usually far away from the city, and it usually takes hours to get out of the airport and into the city. You have to get there and wait for the plane to take off for hours. You can not open the window, and you can not have delicious food.

I like travelling by train. I think trains are the safest(最安全的). Train stations are usually in cities. When you are late for a train, you can catch another one. You can walk around in the train and look out of the window. You can see many interesting things on your way. I know it takes some time.

I also like cars. You can start your trip when you want to, and you don’t need to get to a station. You can carry many things with you, too. But sometimes there are many cars on the road.

小题1:Many people like travelling by plane because_____________.

A．it is interesting

B．it is fast

C．it is cheap

D．it is expensive小题2:What does the underlined phrase “take off” mean?

A．Get to a place.

B．Fly away from a place.

C．Stop at a place.

D．Come back from a place.小题3:If you want to take many things with you, you can take___________.

A．a bus

B．a train

C．a car

D．a boat小题4:The writer thinks that ____________ are the safest.

A．trains

B．planes

C．boats

D．cars小题5:Which of the following is right?

A．Usually you need to spend hours getting out of an airport and getting into a city.

B．You can not see anything from a window when you are on a train.

C．A car never stops at a train station.

D．There are always too many cars on the road.

下列句中划线的成语，运用正确的一项是（）

A．既然知道错了，就应该马上改正，如果犯而不校，那就危险了。

B．靠投机倒把发家的暴发户，居然也附庸风雅，买起字画来了。

C．受到表扬不应趾高气扬，受到批评也不应俯首贴耳。

D．他不管五冬六夏，不管风寒暑湿，每天坚持跑五公里。

已知m²-mn=13，mn-n²=-2，那么，代数式m²-2mn+n²=______．

《污染源自动监控管理办法》规定，( )负责指导全国重点污染源自动监控工作，制定有关工作制度和技术规范。

A．国家环境保护总局

B．国家环境监测总站

C．国家污染源监控司

D．国家发改委

根据政治经济学原理，在一般生产过程中行使职能的是( )资产。

A．固定资产、流动资产

B．国有资产、私有资产

C．固定资产、无形资产

D．私有资产、流动资产