任意两质数的和一定是偶数.______.

题型:解答题

问题:

任意两质数的和一定是偶数.______.

考点:奇数,偶数
题型:解答题

阅读理解。

     Look! There are thousands of people waiting to buy tickets home in the railway station. Each time when

Spring Festival comes, buying tickets of train trip would be very hard. And things seem to be getting worse

and worse, although we have greatly increased the mileage of railway network and speeded up trains. Why?

It's because too many people want to go back home to spend Spring Festival with their family. Many people

become angry with the Ministry (部) of Railways.

     They wonder why it is hopeless for them to get the tickets from the railway station (火车站) Instead,

they sometimes can only buy them from ticket scalpers (票贩) at much higher price.

     The Ministry of Railways estimated (估计) that about 188 million passengers would travel by train during

the 40-day peak (高峰) period surrounding the 2009 Spring Festival holiday. The number of travelers will be

8% higher than that of 2008. This problem even drew the President Hu Jintao's attention. He wrote a note to

Liu Zhijun,Minister of the Ministry of Railways, asking him to take action to improve passenger convenience.

Afterward, officials from the Ministry of Railways said they would try their best not to let any ticket-buyers

spend Spring Festival at the railway station.

1. Many people can't buy the tickets from the railway station, and they sometimes can only buy them

    from the scalpers ________.

A. expensively

B. happily

C. dangerously

D. hardly

2. How many people took the train trip during the peak period surrounding the 2008 Spring Festival holiday?

A. About 203 million.

B. About 188 million.

C. About 180 million.

D. About 174 million.

3. What does the passage mainly tell us?

A. People go home much more easily during the Spring Festival.

B. It is very hard to buy tickets in the railway station during the Spring Festival.

C. President Hu Jintao cares about the railway building problem.

D. The Ministry of Railways felt sorry about the problem.

题型:解答题

2009年1月,我国正式进入移动通信的3G时代。移动通信实际上是利用电磁波传递信号的,那么信号在空中传递的速度约为________m/s。

题型:解答题

恐怖性神经症的主要临床特点包括()。

A、对所怕处境的回避直接造成社会功能受损

B、往往伴有显著的植物性神经系统功能障碍

C、因害怕而感到生活无意义

D、害怕感与所处环境相匹配

题型:解答题

右心功能不全的临床表现主要是由于下列哪项引起的()。

A.心搏出量减少,周围器官供血不足

B.体循环静脉淤血

C.毛细血管通透性增高

D.阻力血管收缩

E.醛固酮增高使血容量增加

题型:解答题

类风湿关节炎病变进程中类风湿因子有()

A.抗体性

B.抗原性

C.感染性

D.遗传性

E.传染性

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