Passage Four
Andrea had never seen an old lady hitchhiking(搭车) before. However, the weather and the coming dark ness made her feel sorry for the lady. The old lady had some difficulty climbing in through the car door, and pushed her big brown canvas shopping bag down onto the floor under her feet. She said to Andrea, in a voice that was almost a whisper. "Thank you dearie—I’m just going to Brockbourne."
Something in the way the lady spoke, and the way she never turned her head made Andrea uneasy about this strange hitchhiker. She didn’t know why, but she felt instinctively that there was something wrong, some thing odd, something.., dangerous. But how could an old lady be dangerous It was absurd.
Careful not to turn her head, Andrea looked sideways at her passenger. She studied the hat, the dirty collar of the dress, the shapeless body, the arms with the thick black hairs... Thick black hairs Hairy arms Andrea% blood froz
A. the hitchhiker was an old woman
B. she was curious about the old lady
C. the lady had a heavy bag
D. she knew the old lady
| Scientists have known for more than two
decades that cancer is a disease of the genes. Something scrambles the DNA
inside a nucleus, and suddenly, instead of dividing in a measured fashion, a
cell begins to copy itself furiously. Unlike an ordinary cell, it never, stops.
But describing the process isn’t the same as figuring it out. Cancer cells are
so radically different from normal ones that it’s almost impossible to untangle
the sequence of events that made them that way. So for years researchers have
been attacking the problem by taking normal cells and trying to determine what
changes will turn them cancerous - always Without success. According to a report in the current issue of Nature, a team of scientists based at M. I .T.’s Whitehead Institute for Biomedical Research has finally managed to make human ceils malignant -a f A. to subject them to two more genes B. to keep the division from slowing down C. to promote the production of telomerase D. to prevent excessive ceils copying [单项选择]
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