A. they believe that there is no limit of living

　　B. they are sure to find the truth about long living

　　C. they have got some ideas about living forever

　　D. they are able to make people live past the present life span 18. Donald Louria’s attitude towards long living is that _______.

　　A. people can live from 120 to 180

　　B. it is still doubtful how long humans can live

　　C. the human body is designed to last past about 120 years

　　D. it is possible for humans to live longer in the future 19. The underlined "it" ( paragraph 4 ) refers to ________.

　　A. a great push

　　B. the idea of living beyond the present life span

　　C. the idea of living from 200 to 300 years

　　D. the conservative estimate 20. What would be the best title for this text?

　　A. Living Longer or Not

　　B. Science, Technology and Long Living

　　C. No Limit for Human Life

　　D. Healthy Lifestyle and Long Living

　　参考答案---17—20、CDBA

　　C8 [2016·浙江卷] B

　　Below is a selection from a popular science book.

　　If blood is red, why are veins(静脉) blue?

　　Actually, veins are not blue at all. They are more of a clear, yellowish colour. Although blood looks red when it's outside the body, when it's sitting in a vein near the surface of the skin, it's more of a dark reddish purple colour. At the right depth, these blood－filled veins reflect less red light than the surrounding skin, making them look blue by comparison.

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