Only three strategies are available for controlling cancer: prevention, screening and treatment. Lung cancer causes more deaths than any other types of cancer. A major cause of the disease is not (21) known; there is no (22) evidence that screening is much help; and treatment (23) in about 90 percent of all cases, at present, therefore, the main strategy must be (24) . This may not always be true, of course, as for some other types of cancer, research (25) the past few decades, has suggested some importance in prevention, screening or treatment. (26) , however, we consider not what research may one day offer but what today’s knowledge could already deliver that is not being delivered, then the most practicable and cost-effective opportunities for (27) premature death from cancer, especially lung cancer, probably involve neither screening nor improved treatment, (28) prevention.
This conclusion does not depend o
A. though
B. when
C. unless
D. if
Passage Two
In only two decades Asian Americans have become the fastest growing the U. S. minority. As their children began moving up through the nation’s schools, it became clear that a new class of academic achievers was emerging. Their achievements are reflected in the nation’s best universities, where mathematics, science and engineering departments have taken on a decidedly Asian character. This special liking for mathematics and science is partly explained by the fact that Asian-American students who began their educations abroad arrived in the U. S. with a solid grounding in mathematics but little or no knowledge of English. They are also influenced by the promise of a good job after college. Asians feel they will be judged more objectively. And the return on the investment in education is more immediate in something like engineering than with an arts degree.
Most Asian-American students owe their success to the influence of parents who a
A. their English is not good enough
B. they are afraid they might meet with unfair judgment in these areas
C. there is a wide difference between Asian and Western cultures
D. they know little about American culture and society
Only individual benefactors and ad hoc grants have made possible the ecological surveys already undertaken.（）
In only two decades Asian Americans have become the fastest-growing U.S. minority. As their children began moving up through the nation schools, it became clear that a new class of academic achievers was emerging. Their achievements are reflected in the nation’s best universities, where mathematics, science and engineering departments have taken on a decidedly Asian character. This special liking for mathematics and science is partly explained by the fact that Asian-American students who began their education abroad arrived in the U.S. with a sol id grounding in mathematics but little or no knowledge of English. They are also influenced by the promise of a good job after college. Asians feel there will be less unfair treatment in areas like mathematics and science because they will be judged more objectively. And the return on the investment in education is more immediate in something like engineering than with an arts degree.
Most Asian-American students owe
A. this
B. that
C. so
D. such
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