职称英语历年真题2009卫生类B级：概括大意与完成句子_职称英语考试真题卫生类

职称英语历年真题2009卫生类B级：概括大意与完成句子

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第3部分：概括大意与完成句子（第23～30题，每题1分，共8分）

下面的短文后有2项测试任务：（1）第23～26题要求从所给的6个选项中为第1～4段每段1选择个最佳标题；（2）第27～30题要求从所给的6个选项中为每个勉励　子确定1个最佳选项。

Cancer

1　　Cancer is a group of many related diseases that begin in cells， the bodys basic building blocks. The body is made up of many types of cells Normally， cells grow and divide to produce more cells as they are needed to keep the body healthy. Sometimes， this orderly process goes wrong. New cells form when the body does not need them， and old cells do not die when they should The extra cells form a mass of tissue called a growth or tumor. Benign （~良性的） tumors are not cancer. They can often be removed and， in most cases， they do not come back Malignant （恶性的） tumors are cancer. Cells in malignant tumors are abnormal and divide without control or order.

2　　Scientists have learned that cancer is caused by changes in genes that normally control the growth and death of cells. Certain lifestyle and environmental factors can change some normal genes into genes that allow the growth of cancer. Many gene changes that lead to cancer are the result of tobacco use， diet， exposure to ultraviolet radiation from the sun， or exposure to carcinogens （致癌物） in the workplace or in the environment. Some gene alterations are inherited.