英语六级阅读理解每日一练(122日)_大学英语阅读

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

　　how cancer cells are formed

　　why cancer cells never stop dividing

　　why normal cells can turn into cancer cells

　　how different normal cells are from cancer cells

　　2. Whiteheads scientists have succeeded in__________

　　developing malignant cells in human bodies

　　making normal human cells cancerous

　　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__________

　　were easier to become aged

　　checked telomerase in dividing

　　had short ends of chromosomes

　　lacked telomeres for cell division

　　4. To make human cells more mouse like scientists tried__________

　　to subject them to two more genes

　　to keep the division from slowing down

　　to promote the production of telomerase

　　to prevent excessive cells copying

　　5. One key factor in creating tumor with human cells is __________

　　lengthening the ends of chromosomes

　　altering the structure of telomeres

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