第二节. 任务型阅读Directions: Read the following t

题目内容：

第二节. 任务型阅读

Directions: Read the following text and choose the most suitable heading from the list A---F for each paragraph. There is one extra heading which you do not need.

Attention must be paid to environmental factors.

Principles of curing cancers.

It will take long to find perfect cures.

An important discovery in the research.

The causative factor of cancer is very clear.

The survival rate differs among patients with various cancers.

71. _____This year, 50 percent of the 910,000 people who suffer from cancer will survive at least five years. In the year 2000 , the National Cancer Institute estimates, that figure will be 75 percent. For some skin cancers, the five-year survival rate is as high as 90 percent. But other survival statistics are still discouraging-----13 percent for lung cancer, and 2 percent for cancer of the pancreas (胰腺) .

72. _______I have great confidence that by the end of the decade we'll know in vast detail how cancer cells arise, " says microbiologist Robert Weinberg, an expert on cancer. "But, " he cautions, "some people have the idea that once one understands the causes, the cure will rapidly follow. Consider Pasteur. He discovered the causes of many kinds of infections, but it was fifty or sixty years before cures were available. "

73. ______The exact process involved is still mysterious, but the likelihood that many cancers are initiated at the level of genes suggests that we will never prevent all cancers. "Changes are a normal part of the evolutionary process,” says oncologist William Hayward. Environmental factors can never be totally eliminated; as Hayward points out, "We can’t prepare a medicine against universe rays.”

74. ______With as many as 120 varieties in existence, discovering how cancer works is not easy. The researchers made great progress in the early 1970s, when they discovered that oncogenes, which are cancer-causing genes, are inactive in normal cells. Anything from universe rays to radiation to diet may activate an inactive gene, but how remains unknown. If several oncogenes are driven into action, the cell, unable to turn them off, becomes cancerous.

75. ______The prospects for cure, though still distant, are brighter. "First, we need to understand how the normal cell controls itself. Second, we have to determine whether there are a limited number of genes in cells which are always responsible for at least part of the trouble. If we can understand how cancer works, we can reduce its action. "

最佳答案：

71---75 FCADB

答案解析：

略

考点核心：

人物传记类文章的文体特征：

人物传记是记叙文体的一种，主要描写某人的生平事迹、趣闻轶事、生活背景、个性特征、成长奋斗历程等，包含记叙文的时间、地点、人物、事件等要素。其特点是以时间的先后或事件的发展为主线，空间或逻辑线索贯穿文章始终，脉络清楚，可读性较强。