题目内容
（请给出正确答案）
Scientists resist talking about their options because they don't want people to
A．know what they are doing.
B．feel their efforts are useless.
C．think the problem has been solved.
D．see the real problem.
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更多“Scientists resist talking abou…”相关的问题
A.know what they are doing
B.feel their efforts are useless
C.think the problem has been solved
D.see the real problem
听力原文： Weather scientists call hurricanes by names to make clear which storm they are talking about. An Australian weather scientist began giving women's names to storms before the end of the nineteenth century. Weather scientists used the names of their girlfriends or wives for storms during World War Two. (33) The United States weather service started officially using women's names for storms in nineteen fifty-three. In nineteen seventy-eight, it began including men's names as well.
(34) Today, scientists make up lists of names years in advance, They agree on them at meetings of the concerned organization. The lists include both American and international names.
The United States National Hurricane Center near Miami, Florida, watches for the development of storms. It gives a name to each one that reaches a wind speed of sixty-two kilometers an hour. A different list of names is used each year. The first name begins with the letter "A". The second begins with "B" and so on. The same list will not be used again for at least six years. The names of storms that have caused extremely severe damage may be retired at the request of the country that was affected. That name will not be used again for at least ten years. (35) This is done to avoid legal problems or confusion. It may be reasonable that the United States asks that the name Katrina be retired.
(34)
A．Before 19th century
B．During World War Two
C．In 1978.
D．In 1953.
Unlocking the Human Genome(基因组)
1 A project to unlock secrets-what scientist could resist that challenge？ This is what many scientists are doing as they work on the Human Genome Project. The aim of the project is to decode(破译)all of the some 100, 000 genes in the human body. Scientists are using DNA fingerprinting techniques to do the decoding.
2 DNA is the substance found in the chromosomes(染色体)of a cell. A chromosome is a chain of genes. Each gene carries a piece of genetic information. At any one moment in a cell, thousands of genes are turned on and off to produce proteins(蛋白质). The challenge for scientists is to find out what role each gene plays in protein production. At some point this decoding will be complete. Then scientists will have a map of an ideal genome, or a picture of the total genetic nature of a human being. The ideal genome is called a consensus(交感)genome. Everything works well in a consensus genome.
3 But no one in the world has a consensus genome. Everyone's genome is different from the ideal. These differences are referred to as genetic mutations(突变). Genetic mutations in a person's genome mean that the person has a greater than average chance of suffering from health problems. Some problems are not life-threatening. These would include things like colorblindness, or mild headaches. Other problems are serious, such as heart disease, or cancer.
4 It will take years to identify the role of each of the 100, 000 genes, The short-term goal of the project is to find the physical and mental health problems a person is likely to encounter during his or her lifetime. The long-term goal is to have each person live a longer, healthier life.
A. How does DNA work？
B. What is the Human Genome Project about？
C. How are the DNA samples collected？
D. What are the goals of the Human Genome Project？
E. What is the role of each gene？
F. What are the consequences of genetic mutations？
Paragraph 1 ______
请根据短文内容，回答题。
The Tough Grass that Sweetens Our Lives
Sugar cane was once a wild grass that grew in New Guinea and was used by local people for roofing their houses and fencing their gardens. Gradually a different variety evolved which contained sucrose (蔗糖) and was chewed on for its sweet taste. Over time, sugar cane became a highly valuable commercial plant, grown throughout the world. __________ (46)＜br＞
Sugar became a vital ingredient in all kinds of things, from confectionery (糖果点心 ) to medicine, and, as the demand for sugar grew, the industry became larger and more profitable.＜br＞
__________ (47) Many crops withered(枯萎)and died, despite growers&39; attempts to save them, and there were fears that the health of the plant would continue to deteriorate.＜br＞
In the 1960s, scientists working in Barbodos looked for ways to make the commercial species stronger and more able to resist disease. They experimented with breeding programmes, mixing genes from the more delicate, commercial type. __________(48) This sugar cane is not yet ready to be sold commercially, but when this happens, it is expected to be incredibly profitable for the industry.＜br＞
__________(49) Brazil, which produces one quarter of the world&39;s sugar, has coordinated an international project under Professor Paulo Arrudo of the Universidade Estaudual de Campinas in Sao Paulo. Teams of experts have worked with him to discover more about which parts of the genetic structure of the plant are important for the production of sugar and its overall health.＜br＞
Despite all the research, however, we still do not fully understand how the genes function in sugar cane __________ (50) This gene is particularly exciting because it makes the plant resistant to rust, a disease which probably originated in India, but is now capable of infecting sugar cane across the world. Scientist believes they will eventually be able to grow a plant which cannot be destroyed by rust.
第46题___________ 查看材料
A.Eventually， a commercial plant was developed which was 5 percent sweeter than before，but also much stronger and less likely to die from disease.
B.One major gene has been identified by Dr Angelique D"Hont and her team in Montpelier，France.
C.Sugar cane is now much more vigorous and the supply of sugar is therefore more guaranteed.
D.Since the 1960s， scientists have been analyzing the mysteries of the sugar cane"s genetic code.
E.The majority of the world"s sugar now comes from this particular commercial species.
F.Unfortunately， however， the plant started to become weaker and more prone to disease.
Henry cannot resist the lure of drugs.
A．abse
B．flavor
C．temptation
D．consumption
Henry cannot resist the lure of drugs.
A．abuse
B．flavor
C．temptation
D．consumption
enry cannot resist the lure of drugs．
A. abuse
B. flavor
C. temptation
D. consumption
