单项选择题
1、
 


2、 下列重大政治军事行动时间顺序排列正确的是（　　）
A．斯大林格勒战役，盟军攻入意大利，开罗会议，美苏军队易北河会师
B．盟军攻入意大利，斯大林格勒战役，美苏军队易北河会师，开罗会议
C．斯大林格勒战役，开罗会议，美苏军队易北河会师，盟军攻入意大利
D．开罗会议，斯大林格勒战役，盟军攻入意大利，美苏军队易北河会师


3、 为巩固抗日民族统一战线，中国共产党领导的抗日根据地在政权建设上采取的重要举措是（　　）
A．开展大生产运动
B．实行减租减息
C．开展整风运动
D．实行“三三制”


4、 20世纪，黄河三角洲曾以每年l千米的速度向海洋推进，造成这一现象的主要原因是（　　）
A．围海造陆
B．海浪侵蚀
C．海平面下降
D．河流泥沙沉积


5、 Would you please keep silent? The weather report__________ and I want to listen．
A．is broadcast
B．is being broadcast
C．has been broadcast
D．had been broadcast


6、阅读下列短文，回答题。
Looking for Pen Pals
      Mary,24 years old, comes from Scotland and would like to find apen pal(笔友)who comesfrom East Europe． She likes playing the piano and listening to jazz music． She is interested in historybut does not like discussing politics．
Jim, 19 years old, comes from South Korea． He would like a pen pal who is interested in discus-sing the differences of life in Europe and Asia． He loves traveling, listening to pop music and playingfootball in his free time．
      Pietro ,42 years old, comes from Argentina． He is a businessperson and would like to find a penpal who is also a businessperson and lives in North America． He likes using the Internet and listeningto light music．
      Helga,31 years old, comes from Germany and speaks French, English and Russian． She wouldlike a pen pal who is interested in exchanging (交流) ideas about language learning． She does notlike using computers for learning and believes that language learning can only happen in a class-room．
      Jennifer, 18, comes from New Orleans． She is interested in discussing the political differences
      between East Europe and North America． She loves horse-riding and listening to jazz music．
      Alessandro,25 years old,comes from Rome． He is interested in finding a pen pal who speaksdifferent languages and can exchange ideas on using computers for learning purposes． He likesplaying football in his free time．
Who are interested in the same kind of music?
A．Mary and Pietro．
B．Pietro and Jim．
C．Jim and Jennifer．
D．Mary and Jennifer．


7、已知集合A={1，2，3，4，6，12}，C={1，2，3，6，9，18}，则A∩C=(  )
A．{1，2，3，4，6，9，12，18}
B．{1,2，3，6}
C．{1，3，6}
D．{1，2，6}


8、
A．over
B．open
C．often
D．only


填空题
9、如图3-6所示，一根细绳的两端分别系于A点和B点，在O点处悬挂一个重物，质量m=10kg,物体处于静止状态，则绳OB的张力是______．(g取10m／s²．)



10、 将8．4g铁粉跟50 mL盐酸充分混合反应后，有固体剩余，同时收集到1．12 L(标准状况下)H₂．原盐酸的物质的量浓度为______mol／L．

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