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 __________
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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