A. By limiting the protein in their diet.

　　B. By cutting the calories in their diet.

　　C. By resetting their clock of aging.

　　D. By keeping their physical fitness.

　　4. What is probably the best title for the article?

　　A. Two Great Experiments.

　　B. The Mystery of Human Life.

　　C. Ways to Lengthen Human Life.

　　D. The Breakthrough in the Study of Aging.

　　【参考答案】1—4、BDAD

　　阅读理解

　　With only about 1,000 pandas left in the world, China is desperately trying to clone the animal and save these in a dangerous situation. That's a move similar to what a Texas A & M University researchers have been undertaking for the past five years in a project called "Noah's Ark".

　　Noah's Ark is aimed at collecting eggs, embryos(胚胎), semen and DNA of these animals and storing them in liquid nitrogen. If certain species should become extinct, Dr. Duane Kraemer, a professor in Texas A & M's College of Veterinary, Medicine, says there would be enough of the basic building blocks to reintroduce the species in the future.

　　It is estimated that as many as 2, 000 species of mammals, birds and reptiles will probably become extinct in over 100 years. The panda, native only to China, is in danger of becoming extinct in the next 25 years.

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