Some people wear masks only in crowds. they expect to come into contact with lots of germs．( )A．whichB．whenC．whereD．as 题目和参考答案——青夏教育精英家教网—

题目内容

20．Some people wear masks only in crowds，_____ they expect to come into contact with lots of germs．（　　）

A．

which

B．

when

C．

where

D．

分析一些人只会在他们认为容易接触病菌的人群中戴口罩．

解答答案：C
题干中they expect to come into contact with lots of germs修饰前面的名词crowds，是一个非限制性定语从句；从句结构完整，要用关系副词；when表示时间，where表示地点．句意表达的是抽象地点，故选C．

点评定语从句是用来修饰名词的形容词性从句，相当于一个形容词．连接定语从句的引导词分为关系代词和关系副词，关系代词在从句中要作主语或宾语；关系副词在从句中作状语．这也是选择关系词的一个判断方法．

练习册系列答案

11．This is the best way I could think of ________ the students ________ the rules．（　　）

	A．	to stop； breaking		B．	stopping； breaking
	C．	stop； to break		D．	stopped； from breaking

8．The reading material might be easier for me to understand if you get this sentence
into Chinese．（　　）

15．The traffic problem has severely affected people's life．，the govenment should spare no efforts to solve it．（　　）

5．听到要放假的消息，我们都很兴奋．（excited）Hearing the news/When we heard the newsthat we would have a holiday，we were all excited．．

1．Since the first Earth Day in 1970，American have gotten a lot"greener"toward the environment．"We didn't know at that time there even was an environment，let alone that there was a problem with it，"says Bruce Anderson，president of Earth Day USA．
     But what began as nothing important in public affairs has grown into a social movement．Business people，political leaders，university professors，and especially millions of grass-roots Americans are taking part in the movement．"The understanding has increased many，many times，"says Gaylord Nelson，the former governor from Wisconsin，who thought up the first．
     According to US government reports，emissions （排放）from cars and trucks have dropped from 10.3 million tons a year to 5.5 tons．The number of cities producing CO beyond the standard has been reduced from 40 to 9．Although serious problems still remain and need to be dealt with，the world is a safer and healthier place．A kind of"Green thinking"has become part of practices．
     Great improvement has been achieved．In 1988 there were only 600 recycling programs； today in 1995 there are about 6，600．Advanced lights，motors，and building designs have helped save a lot of energy and therefore prevented pollution．
     Twenty-five years ago，there were hardly any education programs for environment．Today，it's hard to find a public school，university，or law school that does not have such a kind of program．"Until we do that，nothing else will change!"say Bruce Anderson．

25．According to Anderson，before 1970，Americans had little idea aboutC
A．the social movement
B．recycling techniques
C．environmental problems
D．the importance of Earth Day
26．Where does the support for environmental protection mainly come from？A
A．The grass-roots level
B．The business circle
C．Government officials
D．University professors
27．What have\Americans achieved in environmental protection？D
A．They have cut car emissions to the lowest
B．They have settled their environmental problems
C．They have lowered their CO levels in forty cities．
D．They have reduced pollution through effective measures．
28．What is especially important for environmental protection according to the last paragraph？A
A．Education
B．Planning
C．Green living
D．CO reduction．

18．The need to feed a growing population is putting much pressure on the world's supply of water．With 97% of the world's water too salty to be drunk or used in agriculture，the worldwide Supply of water needs careful management，especially in agriculture，Although the idea of a water shortage（短缺）seems strange to someone fortunate enough to live in a high rainfall country，many of the world's agricultural industries experience constant water shortages．
Although dams can be built to store water for agricultural use in dry areas and dry seasons，the costs of water redistribution（重新分配） are very high．Not only is there the co st of the engineering itself，but there is also an environmental cost to be considered．Where valleys（山谷） are flooded to create dams，houses are lost and wildlife homes destroyed．Besides，water may flow easily through pipes to fields，but it cannot be transported from one side of the world to the other．Each country must therefore rely on the management of its own water to supply its farming requirements．
This is particularly troubling for countries with agricultural industries in areas dependent on irrigation（灌溉）．In Texas，farmers'overuse of irrigation water has resulted in a 25% reduction of the water stores，In the Central Valley area of southwes tern USA，a huge water engineering project provided water for farming in dry valleys，but much of the water use has been poorly managed．
Saudi Arabia's attempts to grow wheat in desert areas have seen the pumping of huge quantities of irrigation（灌溉） water from underground reserves．Because there is no rainfall in these areas，such reserves can only decrease，and it is believed that fifty years of pumping will see them run dry．

72．From the first two paragraphs we learn thatC
A．much of the world's water is available for use
B．people in high rainfall countries feel lucky
C．the costs of water redistribution should be considered
D．water can be easily carried through pipes across th e world
73．Which of the follo wing is true？C
A．The water stores in Texas have been reduced by 75%．
B．Most industries in the world suffer from water shortages．
C．The underground water in Saudi Arabia might run out in 20 years．
D．Good management of water use resulted from the project in the Central Valley．
74．What is most likely to be discussed in the paragraph that follows？A
A．Steps to improving water use management．
B．Ways to reduce the costs of building dams．
C．Measures to deal with worldwide water shortages．
D．Approaches to handling the pressure on water supply．
75．The text is mainly aboutB
A．water supply and increasing population
B．water use management and agriculture
C．water redistribution and wildlife protection
D．water shortages and environmental protection．

19． news that the Chinese Men's National Football Team was disqualified for the next World Cup finals came as no surprise at all．（　　）

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