27. Care should be taken to decrease the length of time that one is ____ loud continuous noise.

　　A. subjected to B. filled with C. associated with D. dropped off

　　28. Some of the most important concepts in physics ____ their success to these mathematical systems.

　　A. oblige B. owe C. contribute D. attribute

　　29. As your instructor advised, you ought to spend your time on something ____ researching into.

　　A. precious B. worth C. worthy D. valuable

　　30. As a defense against air-pollution damage, many plants and animals____ a substance to absorb harmful chemicals.

　　A. relieve B. release C. dismiss D. discard

　　31. Without the friction between their feet and the ground, people would ___ be able to walk.

　　A. in no time B. by all means C. in no way D. on any account

　　32. While typing , Helen has a habit of stopping ____ to give her long and flowing hair a smooth.

　　A. occasionally B. simultaneously C. eventually D. promptly

　　33. One reason for the successes of Asian immigrants in the U.S. is that they

　　have taken great ______to educate their children.

　　A. efforts B. pains C. attempts D. endeavours

　　34.If any man here does not agree with me, he should ____his own plan for

　　improving the living conditions of these people.

　　A. put on B. put out c. put in d. put forward

　　35.I support your decision, but I should also make it clear that I am not going to be ____to it.

　　A. connected B. fastened C. bound D. stuck

　　36.The English language contains a(n)_____of words which are comparative seldom used in ordinary conversation.

　　A. altitude B. latitude C. multitude D. attitude

　　37. In my opinion, you can widen the ____of these improvements through your active participation.

　　A. dimension B. volume C. magnitude D. scope

　　38.Your improper words will give _____to doubts concerning your true intentions.　　A. rise B. reason C. suspicion D. impulse

　　39.The news item about the fire is followed by a detailed report made _____.

　　A. on the spot B. on the site C. on the location D. on the ground

　　40.The remarkable ______of life on the Galopagos Islands inspired Charles Darwin to establish his theory of evolution.

　　A. classification B. variety C. density D. diversion

　　Part Ⅱ Cloze Test

　　牐牐牐燭he first and smallest unit that can be discussed in relation to language is the word. In

　　speaking, the choice of words is 41 the utmost importance. Proper selection will eliminate

　　one source of 42 breakdown in the communication cycle. Too often, careless use of words

　　43 a meeting of the minds of the speaker and listener. The words used by the speaker may 44

　　unfavorable reactions in the listener 45 interfere with his comprehension; hence, the

　　transmission-reception system breaks down .

　　牐牐牐46 , inaccurate or indefinite words may mak