为防止气瓶充气时装错而发生爆炸，可燃气体钢瓶（如氢气、乙炔）的螺纹是（）的。A、反扣

阅读理解。

     At this moment in different places of the world people are doing different things

     In Beijing it's early morning. People are sleeping.

     In London people are leaving work to go home. They are waiting for buses or trains. Some people

are driving their cars. Some are having afternoon tea at home or walking to the pubs (酒吧) to have a

drink.

     In Moscow it's evening and people are having supper at home or in restaurants. Some are going to

watch a ballet (芭蕾舞). Some are drinking in the pubs.

     In Los Angeles (洛杉矾) it's morning. People are working in their offices. Children are starting their

lessons.

     New York is noon now. People aren't working but having lunch. They are eating hamburgers or hot

dogs and drinking coffee or Coke. Some people are seeing friends or shopping.

1. According to the passage we can see that at night some people in Moscow like to _____.

A. go to watch a ballet  

B. do shopping  

C. wait for buses  

D. go to the library

2. When children in Los Angeles are starting their lesson, people in Beijing are _____.

A. playing basketball      

B. seeing films    

C. having lessons    

D. sleeping

3. From the passage, we can see the time in New York now is _____.

A.  6:00          

B. 9:00          

C. 10:00          

D. 12:00

4. We know that London is 3 hours _____.

A. earlier than Moscow            

B. later than Moscow

C. earlier than Los Angeles          

D. later than Los Angeles

5. This passage mainly talks about _____.

A. science      

B. holiday      

C. time difference (区别)    

D. life in western countries

近几年，国内学术造假和腐败问题频发，屡屡成为社会关注的热点。院士申报造假、著作抄袭剽窃、写论文找枪手、发文章挂名搭车、伪造数据或结果，还有名人学历或经历造假的，（），层出不穷，不断（）社会公众心目中学术界的清高形象和道德底线。很多专家学者都提出对各种学术造假“零容忍”，保护住社会良知的最后一片净土。依次填入划括号处最恰当的一项是（）。

A.形形色色；抹黑

B.林林总总；挑战

C.丰富多彩；诋毁

D.屡见不鲜；践踏

10kv架空电力线路通过雷电活动强烈地区时，宜将铁横担及绝缘子固定点进行可靠接地，接地电阻不宜超过（）。

A.1Ω

B.4Ω

C.10Ω

D.30Ω

年利率为6%，设每季度复利一次，若10年内每季度都能得到1000元，则现在应存款（）元。已知：（P/A，6%，40）=15.046。

A.7523 

B.13469 

C.14958 

D.15046

（）是指以去奶脯、排骨的猪方肉（肋条）为原料。

A、大培根

B、排培根

C、奶培根

D、培根