如果能在短时间内让黑夜如同白昼,可以向天空发射一种照明弹,该照明弹选用的主要材料

题型:选择题

问题:

如果能在短时间内让黑夜如同白昼,可以向天空发射一种照明弹,该照明弹选用的主要材料是(  )

A.铝片

B.炭粉

C.铁粉

D.镁粉

考点:S,Fe,C,P等物质在氧气中的燃烧
题型:选择题

大跨径连续梁桥的承载结构混凝土浇筑常采用的施工方法是( )。

A.移动模架逐孔施工法

B.顶推法

C.悬臂浇筑法

D.转体施工法

题型:选择题

第三部分:阅读理解(共16小题;每小题1.5分,满分24分)

阅读下列短文,然后从各题所给的A、B、C、D四个选项中,选出最佳选项。  

You’ve no doubt heard people say how much they “need” a holiday, when what they really mean is that they want one. Certainly, people working under pressure feel a very strong desire to escape from work and become less tight during holidays, and experience a changed environment.

However, work for many people today is office work and mental, rather than physical tasks. These people may seek much more energy-taking activities while on holiday, rather than simply lying on a beach. 

Once people become used to going on holiday, taking holidays becomes a habit. For many people the holiday is one of the last things to be given up, and indeed many workers have chosen to spend some of their last pay when being on holiday. It may give them a “lift” in facing some difficulties in life.

Most of us also enjoy showing off the lovely tans --- dark skins we get from a holiday. So many tourists are now able to afford holidays in the sun that tans have become quite common; although we join a tan together with health, it has been fully shown that too much sunshine will result in high danger of skin problems, as well as drying out one’s skin and leading to more lines on your face later in life.

56.According to the passage above, more and more people choose to have holidays because they __________.

A. love working outdoors all the time    

B. want to get away from work

C. love enjoying the beauties of nature   

D. become rich and want a better life

57. When office people have holidays, they often _________ .

A. lie on the beach and enjoy sunshine  

B. spend more than they can afford

C. think about their work on the beach  

D. choose to do more physical exercise

58 The word “lift” in the last sentence of the third paragraph may _______  

A. cheer someone up                

B. help someone find a job

C. be the last thing not to be given up   

D. bring good luck to someone

59 At the end of the passage the writer tries to tell the reader _________.

A. the importance of getting sunshine   

B. the bad effect of being on holiday

C. the result of getting sun tanned

D. the healthy look of being tanned 

题型:选择题

大动脉中膜()

A.管径小于0.3mm

B.大量弹性膜

C.大量纵行平滑肌

D.大量环形平滑肌

E.管径0.3~1mm

题型:选择题

在影响经济增长的间接因素中,最重要的有()和制度两大类。

题型:选择题

手推调车

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