当空气中可燃性气体含量达到或超过爆炸下限的（），报警仪发出二级声光报警信号。A、30

阅读理解。

    Sandstorms (沙尘暴) happen suddenly and have effects on large areas. One example was a sandstorm on the Western  Route. It  moved  quickly  southward (向南 ) from May 4th to 6th,1993,having effects on a total area of l.1 million sq km,from northern Xinjiang to the Hexi area of Gansu,western Inner Mongolia and most of the Ningxia Hui Autonomous Region. The wind speed reached 37. 9  m/s, and the visibility (可见度) was less than 50m. In Xinjiang,Gansu,Inner Mongolia and Ningx-ia,85 persons died and 264 were injured;4,412 houses were damaged,and 120,000 animals died or went missing. The direct economic  losses (直接的经济) were about 550 million yuan,which further damaged the environment and economic development. Another example was the sandstorm which happened from April 16th to 18th,1998. Blowing from west to east,it even reached the lower reaches of the Yangtze River. This never happened  in hisl.ory. A sandstorm meeting rain over Beijing formed " muddy(多泥的 ) rain" there. Floating dust  troubled  the Inner Mongolia Autonomous Region, Beijing, Ji'nan of Shandong Province and Nanjing.

1. How many areas did the sandstorm in 1993 have effects on?   

A. Three.    

B. Four.    

C. Five.    

D. Six.

2.         persons were injured in the sandstorm in 1993.       

A. 85                

B. 264

C. 4,412              

D. 120,000

3. The sandstorm in 1998 started blowing from          .   

A. east          

B. south      

C. west        

D, north

4. Which of the following is true according to the article?    

A. The sandstorm in 1998 lasted three days.

B. Sandstorms just happen in the west of China.

C. Sandstorms like the one in 1993 never happened in history.

D. A person could see the building 100 meters far from him in the sandstorm in 1993.

一位同学在查阅史料时发现有如下表述：“思想界大飓风”“欢呼三贼罢官”“打倒列强，除军阀”“国旗为五色，民众笑开颜”。以下相对应的历史事件正确的是   [ ]

A、新文化运动、五四运动、辛亥革命、抗日战争  

B、戊戌变法、五四运动、第一次国共合作、辛亥革命  

C、五四运动、新文化运动、国共对峙、国共合作  

D、戊戌变法、五四运动、国共合作、战略转折

男，20岁，因车祸伤到急诊室时血压70/40mmHg，心率每分140次，初步诊断为重度出血性休克。

休克时，5～10分钟快速静滴等渗盐水250ml后，如血压升高而中心静脉压不变则提示（）。

A.心功能不全

B.血容量过多

C.容量血管过度收缩

D.血容量不足

E.肾功能不全

（1）文以载道，立德立人，中国古代散文十分注重传统精神的弘扬熏陶，如：“君子博学而日参省乎己，              。”（荀子《劝学》）“是故无贵无贱，无长无少，道之所存，                。”（韩愈《师说》）“                 ，可以无悔矣，其孰能讥之乎？”（王安石《游褒禅山记》）“夫天地之间，物各有主，苟非吾之所有，             。”（苏轼《赤壁赋》）这些思想观念至今仍能陶冶性情，滋养灵魂。

（2）英国戏剧家、诗人          创作的《             》《奥赛罗》《李尔王》《麦克白》并称“四大悲剧”。

照片上相邻组织影像界线的清楚明了程度称

A．模糊度
B．对比度
C．锐利度
D．颗粒度
E．失真度