题目内容
（请给出正确答案）
On the table was a vase filled with artificial flowers．
A. wild
B. fresh
C. lovely
D. false
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A、offending
B、offish
C、offensive
D、offspring
A、Don’t worry about it.
B、What’s wrong with you?
C、What’s happened?
D、You have done well.
A、antithesis
B、anaphora
C、oxymoron
D、pun
A.stay confused
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Geneticengineering began when the DNA molecule c分子）, the most basic unit of life, was firstdescribedin 1953 by James Watson and Francis Crick. An understanding of DNA led to thealtering ofnormal cell reproduction. Experiments with altering human cellsbegan in 1970 In one of the first ex-periments, patients were injected with avirus that would produce a life-saving enzyme, but theirbodies would not acceptit. In 1980 patients with a rare but fatal blood disease were injected with apu-rified gene that was cloned through DNA technology. Another failure.
Geneticengineering got a legal boost（激励） in 1980. The U. S. Supreme Court said that a patentcould be granted on a genetically engineered"oil-eating" bacterium（细菌）. This bacteriumwould helpclean up oil spills. The ruling encouraged companies to invent newlife forms, and three importantmedical products were quickly developed.
Humaninterferon（干素）一a possible solution to some cancers and viral disease. A newlyengi-neered bacterium produced human interferon as a by-product. This newproduct reduced the cost of in-terferon.
Humangrowth hormone-for children whose bodies do not grow to normal height. Anexpensivegrowth hormone（荷尔蒙） was previously produced from human cadavers, but by changing thegeneticmake-up of the single-cell bacterium E. coli, and affordable growthhormone could be produced.
Humaninsulin (胰岛素)-for the treatment of diabetes. People with diabetes used to rely on abeef-orpork-based product until 1982. Now insulin can be manufactured bygenetically altered bacteria.
Advancesin genetic engineering have continued, though they constantly must be weightedagainst the safety of procedures. There is clearly much more to discover.
This passage is mainly about
A. the effects of altering cells
B.the human growth hormone
C.insulin resistance
D. U. S. Supreme Court rulings
A.immigration
B.Caribbean history
C.the island's natural beauty
D. Puerto Rican cuisine
A.It is eaten before meals
B.It is added to other dishes.
C.It is used where foods are too spicy.
D.It is eaten as a main dish.
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