托福TPO68阅读+题目+答案：Research into Aging and Extending Life Span

托福TPO68阅读+题目+答案：Research into Aging and Extending Life Span

[Paragraph 1]The mounting evidence for age genes that influence the aging process is by no means conclusive, but it is quite impressive, coming from a variety of independent research from aging in worms and fruit flies to antioxidants and gene repair mechanisms, and human mutations. Still, the connections are circumstantial

 1.(单选题)

The word “conclusive' in the passage is closest in meaning to

A.clear

B.independent

C.usual

D.final

2.(单选题)

According to paragraph 1. evidence for age genes has come from research into each of the following EXCEPT

A.mutations in humans

B.aging in fruit flies

C.connections among various genes

D.the process by which damaged genes get repaired

[Paragraph 2]Christopher Wills, professor of biology at the University of California in San Diego, thinks that by 2025 science will likely isolate the mammalian age genes in mice. We share roughly 75 percent of our genes with mice and have much the same body chemistry; this is a strong reason to believe that an age gene found in mice could also be at work in humans. If such genes are located, the next step would be to find out if these age genes have their counterparts in humans Wills believes that if they are found in humans, they may extend the human life span perhaps to 150 years.

 3.(单选题)

According to paragraph 2, success at isolating age genes in mice would provide support for the idea that

A.mice and humans have very similar body chemistry

B.mice and humans have about 75 percent of their genes in common

C.aging in mice occurs more rapidly than aging in humans does

D.age genes are likely to be found in humans

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