Today's technique of paper production is due to Cai Lun.who tree barks.old fishing nets and rags as raw materials．( )A．has usedB．was usingC．had usedD．used 题目和参考答案——青夏教育精英家教网—

题目内容

8．Today's technique of paper production is due to Cai Lun，who _____ tree barks，old fishing nets and rags as raw materials．（　　）

A．

has used

B．

was using

C．

had used

D．

used

分析今天的造纸技术是因为蔡伦发明的，他使用树皮、旧的渔网、以及破布作为原材料．

解答答案：D
根据句意可知，who _____ tree barks，old fishing…是非限制定语从句修饰先行词 Cai Lun，句子缺少谓语动词，而蔡伦造纸使用树皮、旧的渔网、以及破布作为原材料是发生在过去的事情，故只能用一般过去时．

点评考生在答题时要根据具体语境做出选择．

练习册系列答案

19．What day is July 4th？
A．Sunday． B．Monday． C．Tuesday．

16．Where is the woman going for holiday this year？
A．Turkey．B．Canada．C．Italy．

3．What did the woman like best about her holiday？
A．The historical center．B．The water park．C．Some museums．

2．Some countries have a large number of earthquakes．Japan is one of them，while others do not have many，for example，there are few earthquakes in Britain．There is often a great noise during an earthquake．The ground vibrates （颤动）．Houses fall down．Railways are broken，which causes trains to turn over．Sometimes thousands of people are killed in different ways．About 60，000 were killed in 1783 in the south of Italy．Some people say that earthquakes often
happen near volcanoes（火山），but it is not true．The centers of some earthquakes are under the sea．The bottom of the sea suddenly moves．The powerful forces inside the earth break the rocks．The coast is shaken and great waves appear．These waves travel long distances and rush over the land when they reach it，breaking down houses and other buildings．Sometimes they break more buildings than the earthquake itself．
A terrible earthquake happened in Assam，India，in 198 6．The land near Shillong suddenly moved 1.5 feet to one side，and then back again．It continued to act like this 20 times a minute．Few buildings could stand what was happening and the great stones flew four feet up into the air．What kind of building stays up best in an earthquake？The Americans carefully studied the results of the earthquake at San Francisco（1906）and believed it best for buildings to be made with concrete（混凝土） walls together by steel frames．Such are the buildings that can't burn or fall easily．
25．Which of the following is NOT true？D
A．Trains'turning over is directly caused by the earthquakes．
B．Some earthquakes have their centers under the sea．
C．It isn't certain that earthquakes happen near volcanoes．
D．Buildings with concrete walls are better against earth quakes．
26．Earthquakes often happen．B
A．near volcanoes            B．Both A and D
C．in Britain                 D．in Japan
27．D make（s） more loss than the earthquake itself．
A．Nothing                           B．Volcanoes
C．Forces inside the earth           D．Terrible waves by the earthquake
28．When an earthquake happens，Ccan be heard．
A．trains                   B．thousands of people
C．a great noise            D．the powerful forces．

9．The boysought（seek） advice from his teacher．

6．Not until I began to workdid Irealize how much time I had wasted．

13．I've never known anyone who cared soselflessly（无私地） about children．

试题分类