What worries us， with our lack of scientific knowledge and our quick imagination， is both the big and little pieces， although project officials say there is a very small chance that anyone will be injured by them。
That’s good to know， but it doesn't remove the doubts of the millions who still remember the nuclear accident at Three Mile Island。 That accident took place in 1979 in spite of what the officials had assured us as to the safety of the nuclear reactor。
21。 Where the Skylab will fall ________。
A) is kept secret C) has been predicted by scientists
B) has been made public D) can't be predicted even by computers
22。 According to the passage， what does an incident such as the failed Skylab make us do?
A) Not to believe in officials。 C) Think about our future。
B) Trust computers more。 D) Fear for our lives。
23。 The author suggests that ________。
A) the danger of the Skylab's fall has been overestimated
B) it’s useless to worry over things you can't do anything about
C) computers can solve the problem caused by the broken Skylab
D) the danger of the Skylab's fall has been underestimated
24。 The author refers to Three Mile Island ________。
A) because he fears that a piece of the Skylab may strike a nuclear power plant
B) because he is doubtful about what the officials said
C) because he is afraid of the use of nuclear power
D) because the nuclear reactor there and the Skylab were both built by the same company
25。 The main point of the passage is the author's ________。
A) interest in the failure of the Skylab
B) willingness to give his advice
C) concern that science cannot answer all questions
D) eagerness to see more new scientific discoveries
Questions 26 to 30 are based on the following passage:
As supplier of most of the food we eat and of raw materials for many industrial processes， agriculture is clearly an important area of the economy。 But the industrial performance of agriculture (the relative efficiency of agricultural production compared to other areas in the economy) is even more important than this。 For in nations where the productivity of farmers is low， most of the working population is needed to raise food and few people are available for production of investment goods or for other activities required for economic growth。 Indeed， one of the factors related most closely to the per capita income (人均收入) of a nation is the fraction of its population engaged in farming。 In the poorest nations of the world， more than half of the population lives on farms。 This compares sharply with less than 10 per cent in western Europe and less than 4 per cent in the United States。In short， the course of economic development in general depends in a fundamental way on the performance of farmers。 This performance， in turn， depends on how agriculture is organized and on the economic environment， or market structure， within which it functions。 In the following pages the performance of American agriculture is examined。 It is appropriate to begin with a consideration of its market structure。26。 This passage is most probably ________。
A) an item in a newspaper C) part of a lecture
B) an advertisement D) part of the introduction in a book
27。 What is most important about the industrial performance of agriculture is ________。
A) the amount of food it produces C) the percentage of population involved
B) the per capita income of farmers D) the production of investment goods
28。 The word "this" (Para。 1， Line 4) refers to ________。
A) the productivity of farmers
B) the provision of food and raw materials
C) the production of investment goods
D) the economy as a whole
29。 The performance of farmers essentially determines ________。
A) the size of the working population C) the structure of the market
B) the organization of agriculture D) the general development of the economy
30。 This passage will most probably be followed by a discussion of ________。
A) the market structure of American agriculture
B) the structure of the American farming populationC) the various functions of American agriculture
D) the organization of American agriculture
Questions 31 to 35 are based on the following passage:
Editor:While a new school term is about to begin， perhaps we should reconsider the matter of examinations。 In July， two writers (Letters to the Editor) praised the cancellation of exams because they believe "tests don't tell the whole story。"As a teacher who has worked in four countries， I have had the experience that a student who earns good marks is generally a good student， and that a student’s final mark in a subject is usually a grade average of the year's work。 Of course there are exceptions， but they do not have the frequency that would give an unfair picture of a student’s ability。The simple fact is that proper class work， diligent exam studies and good marks are almost certain indicators of a student’s future performance。 The opposite is， almost certainly， incompetence。There is no acceptable substitute for competition and examination of quality。 How can teachers and future officials determine what a student has learned and remembered? Should we simply take the student’s word for it? Any institution that "liberates" students from fair and formal exams is misguided， if not ignorant。 And surely the "graduates" of such institutions will lack trustworthiness， not to mention being rejected by foreign universities for graduate or other studies。When all is said and done， I sense that a fear of failure and a fear of unpleasant comparison with others is at the bottom of most ban-exams (废除考试) talk。 Excellence and quality fear nothing。 On the contrary， they seek competition and desire the satisfaction of being the best。31。 Which of the following will the author of this passage probably agree with?
A) Tests are not effective in measuring the students' abilities。
B) Tests are an effective measure of the students' abilities。
C) Tests can only measure some of the students' abilities。
D) Tests may not be useful for measuring students' abilities。
32。 The two writers mentioned in the first paragraph ________ 。
A) opposed judging students by the results of exams
B) must have proposed other ways of testing students
C) regarded exams as a way of punishing students
D) seemed to be worried about the poor marks of their students
33。 According to the letter， a student’s final mark ________ 。
A) is often encouraging
B) often gives a fair picture of the year’s work
C) often proves unreliable
D) often tells whether he likes the subject or not
34。 If a student graduated from a university which does not require exams he would _______。
A) have to continue his studies C) be incompetent
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