【正文】 movements of the cilia sweep dust and other unwanted materials up and out of the air passages. (8) At the ends of the very smallest bronchial tubes, the air goes into many tiny cupshaped parts. (9) These are the air sacs, or alveoli, which are arranged around the tubes somewhat like a bunch of grapes on a stem. (10) Scientists have estimated that a person39。 use of their life cycles to control insectpests. C. the life cycle of the stalk borer. D. the role of wild plants in the control of the stalk borer. E. the work of entomologists. Select the sentence which best summarizes the main idea of the passage. GENERALIZATION A. The scientists who study insects are called entomologists. B. Burning the wild plants in late autumn or early spring greatly reduces the number of stalk borers that attack cultivated plants. C. By learning the life cycle of insects, scientists have found ways to control insect pests. D. Entomologists discover what an insect is like in each state of its development, where it lives, and what it eats. E. The extent of the damage caused by insects can only be established by entomologists. Stalk borer adults appear DETAIL A. and lay their eggs in cultivated plants. B. on wild plants reached by them as pupae. C. on and bore into, stems of wild plants. D. on cultivated plants reached by them as larvae. E. from pupae in the stems of wild plants. The author describes the life cycle of the stalk borer to show COMMUNICATION A. that entomologists are scientific. TECHNIQUE B. how plicated are the stages of an insect39。 The author points out that men are better than they seem in order to show that COMMUNICATION A. it is foolish for us to be cowardly and fear our neighbors. TECHNIQUE B. we need not fear39。s upriver and downriver trips, E. the distance from Albany to New York is shorter than that from New 2 York to Albany. The author states that he had a light breeze blowing against me the whole way both going and ing to COMMUNICATION A. provide local color in his39。s steamboat trip was successful. C. most people doubted that the steamboat would be of the least use. D. the voyage was performed wholly by the power of the steam engine. E. the steamboat, unlike a sailboat, can be used successfully with the wind against it. (a) Assuming that Poughkeepsie is midway between New York and Albany, and that Fulton39。s main thought is that GENERALIZATION A. the steamboat voyage turned out more favorably than he had expected. B. the author39。s trip north than on the reverse leg of his journey. C. no sailboat could have ever made Albany from New York in less than 32 hours. D. sailboats were having difficulty with headwinds on both the author39。s .main thought is that GENERALIZATION A. flattery is always acceptable. B. it is foolish cowardice which holds back our trust. C. we must be shamed out of our nonsense. D. reality with its pain can make men better. E. honesty is sometimes resented but often admired. The author advises us to SIGNIFICANCE A. stop being a ghost. B. bear in mind that men like flattery. C. face up to, and express, the truth. D. stop being a coward even though it .may make enemies. E. thank people when they tell the unvarnished truth。s Joy. D. Concrete, a Test of Character. E. How to Finish Concrete. Two of the main thoughts in this passage are (1) preparation of forms for the concrete must be thorough, and (2) forms must be allowed to remain on long enough. The third main idea is GENERALIZATION A. taking off forms beforehand will probably cause a crack in the body of the work. B. trying to make changes after concrete has been poured is not remended. C. mixing concrete properly will make it very hard and strong. D. keeping concrete from shrinking as much as possible is desirable. E. using as little water as possible is remended. In mixing concrete, one of the desires the amateur must resist is to SIGNIFICANCE A. break off a corner to see if the “green has gone. B. leave the form on too long. C. strip off the forms a day after the concrete has properly hardened. D. use too much water. E. use too little water. A human quality apparently not essential in someone who works with concrete is CONCLUSION A. carefulness. B. patience. C. selfcontrol. 7 D. sense of spatial relations. E. inventiveness. By the concrete being too green, the author means that the concrete has VOCABULARY A. bee discolored because of its contact with the wooden forms. B. bee cracked. C. not yet cured. D. not dried out. E. not settled in place. In instructing the reader in the intricacies of working with concrete, the author COMMUNICATION A. gives specific instances of concrete work that went wrong. TECHNIQUE B. allows the reader to find the solution to