Passage 2

(19) My research focus is on what happens to our immune system as we age. So the job of the immune system is to fight infections. It also protects us from viruses, and from autoimmune diseases. We know that as we get older, it’s easier for us to get infections. So older adults have more chances of falling ill. This is evidence that our immune system really doesn’t function so well when we age. In most of our work, when we’re looking at older adults who’ve got an illness, we always have to have health controls. So we work very closely with a great group of volunteers called the ‘One Thousand Elders’. These volunteers are all 65 or over, but in good health. (20) They come to the university to provide us with blood samples, to be interviewed, and to help us carry out a whole range of research. (21) The real impact of our research is going to be on health in old age. At the moment, we’re living much longer. Life expectancy is increasing at two years for every decade. That means an extra five hours a day. I want to make sure that older adults are still able to enjoy their old age, and that they’re not spending time in hospital with infections, feeling unwell and being generally weak. (21) We want people to be healthy, even when they’re old.

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19. What is the focus of the speaker’s research?

[D] The change in people’s immune system as they get older.

20. What are the volunteers asked to do in the research?

[B] Offer blood samples.

21. What does the speaker say will be the impact of his research?

[C] Helping improve old people’s health conditions.

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解析：

這篇短文主要講的是對健康老年人的免疫系統(tǒng)的科學(xué)研究，旨在提高人們的健康水平。做科學(xué)研究的短文題需要使用好答案提示詞，并關(guān)注研究的目的和結(jié)果。做第19題需要關(guān)注開頭，做第20題可以用答案提示詞but進(jìn)行定位，而做第21題需要去關(guān)注研究的結(jié)果和影響。