修路队第一天和第二天共修路194千米，第二天和第三天共修路163千米，已知三天共

A. Attention must be paid to environmental factors.

B. Principles of curing cancers.

C. It will take long to find perfect cures.

D. An important discovery in the research.

E. The causative factor of cancer is very clear.

F. The survival rate differs among patients with various cancers.

小题1:___________

“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. ”

小题2:____________

This year, 50 percent of the 910,000 people who suffer from cancer will survive at least five years. In the year 2020, 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) .

小题3:___________

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.

小题4:____________

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.”

小题5:____________

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. ”

王某，男，35岁，口腔卫生良好，无龋齿及牙周疾患。第一磨牙中性关系，颊向，上颌可用间隙92mm，必需间隙95mm，下颌牙列平齐，余正常。

如果采用邻面去釉的方法，那么每个牙去除釉质的厚度最多是（）

A.0.5mm

B.0.75mm

C.0.25mm

D.0mm

E.0.45mm

公安领导工作的内容不包括( )。

A．政治领导工作

B．行政领导工作

C．协调各项工作关系

D．业务领导工作

阅读下面的一首宋词，然后回答问题。

　　【注】①若为情：何以为情，难为情。

（1）“催”字在词的前两句中有怎样的表达效果？请简要分析。

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（2）这首词在情与景的处理上很有特色，宋人曾季貍称赞说“甚有思致”，请结合下片句子，谈谈你的理解。

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经营者以预收款方式提供商品或者服务的，应当按照约定提供，未按照约定提供的，应当按照消费者的要求，（）

A.承担预付款的利息

B.履行约定

C.退回预付款

D.承担消费者必须支付的合理费用