题目内容

7．He worked in a car factory for four years，______ he founded his own company in his hometown．（　　）
A．after whichB．after whenC．after thatD．after it

分析 他再一家汽车工厂工作了四年，之后他在家乡建立了自己的公司．

解答 答案A．分析句子结构可知，逗号之前是主句，逗号之后是非限制性定语从句，从句中主语为he，谓语动词为found，宾语为his own company，从句中不缺少主、宾、表等主要成分应该用关系副词，关系副词可理解为介词+关系代词whom（先行词指人时）/which（先行词指物时），主句与从句存在动作先后的时间关系，因此用介词用after，因此从句中为after which，which指代前面整个主语的内容，故选A．

点评 本题考查非限制性定语从句．解答此类题目首先要分析句子结构，非限制性定语从句中逗号是一个明显的标志，然后分析非限制性定语从句中的成分，如果缺成分用关系代词，如果不缺成分用关系副词．

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A．Following space order                       
B．Following time order
C．Making classifications                       
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A．finished； are goingB．finished； go
C．finishes； are goingD．finishes； go
9．No one is sure how the ancient Egyptians built the pyramids near Cairo．But a new study suggests they used a little rock‘n'roll．Long-ago builders could have attached wooden pole s to the stones and rolled then across the sand，the scientists say．
"Technically，I think what they're proposing is possible，"physicist Daniel Bonn said．
People have long puzzled over how the Egyptians moved such huge rocks．And there's no obvious answer．On average，each of the two million big stones weighed about as much as a large pickup truck．The Egyptians somehow moved the stone blocks to the pyramid site from about one kilometer away．
The most popular view is that Egyptian workers slid the blocks along smooth paths．Many scientists suspect workers first would haveput the blocks on sleds（滑板）．Then they would have dragged them along paths．To make the work easier，workers may have lubricated the paths either with wet clay or with the fat from cattle．Bonn has now tested this idea by building small sleds and dragging heavy objects over sand．
Evidence from the sand supports this idea．Researchers found small amounts of fat，as well as a large amount of stone and the remains of paths．
However，physicist Joseph West think there might have been a simpler way，led the new study．West said，"I was inspired while watching a television program showing how sleds might have helped with pyramid construction．I thought，‘Why don't they just try rolling the things？‘"A square could be turned into a rough sort of wheel by attaching wooden poles to its sides，he realized．That，he notes，should make a block of stone"a lot easier to roll than a square"．
So he tried it．
He and his students tied some poles to each of four sides of a 30-kilogram stone block．That action turned the block into somewhat a wheel．Then they placed the block on the ground．
They wrapped one end of a rope around the block and pulled．The researchers found they could easily roll the block along different kinds of paths．They calculated that rolling the block required about as much force as moving it along a slippery（滑的）path．
West hasn't tested his idea on larger blocks，but he thinks rolling has clear advantages over sliding．At least，workers wouldn't have needed to carry cattle fat or water to smooth the paths．

46．It's widely believed that the stone blocks were moved to the pyramid site byC．
A．rolling them on roads
B．pushing them over the sand
C．sliding them on smooth paths
D．dragging them on some poles
47．The underlined part"lubricated the paths"in Paragraph 4meansD．
A．made the path wet
B．made the path hard
C．made the path wide
D．made the path slippery
48．What does the underlined word"it"in Paragraph 7refer to？A
A．Rolling the blocks with poles attached．
B．Rolling the blocks on wooden wheels．
C．Rolling poles to move the blocks．
D．rolling the blocks with fat．
49．Why is rolling better than sliding according to West？D
A．Because more force is needed for sliding．
B．Because rolling work can be done by fewer cattle．
C．Because sliding on smooth road is more dangerous．
D．Because less preparation on path is needed for rolling．
50．What is the text mainly about？D
A．An experiment on ways of moving blocks to the pyramid site．
B．An application of the method of moving blocks to the pyramid site．
C．An argument about different methods of moving blocks to the pyramid site．
D．An introduction to a possible new way of moving blocks to the pyramid site．

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