Italian scientist Rita Levi-Montalcini, who is 101-year-old and is still active in medical science, has described the force that keeps driving her on: "Progress is created through imperfection." In 1986 she and her lab colleague were awarded the Nobel Prize for Medicine for their work on nerve growth factor. She's convinced that humans grow on challenges.

With so many brilliant examples given, we can see clearly that age is no barrier to some high achievers. 45. From the first two paragraphs, we can see ______.

A. being active at 102 is achievable for everybody

B. Oliveira owes his long life to his mother’s help

C. being fit in old age is a matter of luck and character

D. social skills and wisdom are difficult for the senior

46. How many centenarians are mentioned in this passage?

A. 4

B. 5

C. 6

D. 7 47. By saying "Should I just sit at home and wait until they come and pick me up?” in

Paragraph 5, Heesters shows us he ________.

A. wants to sit or lie in comfort

B. is waiting for people to pick him up

C. is willing to work till he dies

D. prefers to give performance at home

48. In the passage so many examples were given to show ________.

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