英语六级阅读理解练习题

时间：2020-12-27 14:34:59 英语六级我要投稿

英语六级阅读理解练习题

　　1. The problem that has been annoying cancer researchers for years is the difficulty in telling __________

英语六级阅读理解练习题

上海油压工作室　　how cancer cells are formed

　　why cancer cells never stop dividing

上海油压工作室　　why normal cells can turn into cancer cells

　　how different normal cells are from cancer cells

上海油压工作室　　2. Whiteheads scientists have succeeded in__________

　　developing malignant cells in human bodies

　　making normal human cells cancerous

上海油压工作室　　controlling the change of human cells

　　changing the genes of cancer cells

　　3. In the 1983 experiment, human cells didnt work the way mouse cells did because the former__________

上海油压工作室　　were easier to become aged

上海油压工作室　　checked telomerase in dividing

　　had short ends of chromosomes

上海油压工作室　　lacked telomeres for cell division

　　4. To make human cells more mouse like scientists tried__________

上海油压工作室　　to subject them to two more genes

上海油压工作室　　to keep the division from slowing down

上海油压工作室　　to promote the production of telomerase

上海油压工作室　　to prevent excessive cells copying

上海油压工作室　　5. One key factor in creating tumor with human cells is __________

　　lengthening the ends of chromosomes

上海油压工作室　　altering the structure of telomeres

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