答案　D

　　43. Which of the following is most affected by experience according the passage?

　　A．Eating habits.

　　B．Eye­sight.

　　C．Pain resistance. D．Marriage patterns.

　　解析　细节理解题。根据第三段中的“But resistance to pain is largely dependent on experiences.”可知，应选C。

　　答案　C

　　C

　　Have you seen Jurassic Park? In this film, scientists use DNA kept for tens of millions of years to clone dinosaurs. They find trouble, however, when they realize that the cloned creatures are smarter and more dangerous than expected.That's nothing more than a fiction.

　　But could we really clone endangered animals?

　　To date, the most successful attempt to do so was the cloning of a gaur, a rare ox­like animal from southeast Asia.Scientists used a cow to bring the cloned baby gaur, named Noah. Two days after birth, however, Noah died from a common bacterial infection. Other endangered species that may be cloned include the African bongo antelope (邦戈羚羊), the Sumatran tiger, the cheetah (猎豹), and the giant panda.

　　Next, could we really clone extinct animals?

　　In theory? Yes. To do this, you need a well­kept source of DNA from the extinct animals such as wool mammoth (毛象), Tasmanian tiger, or even dinosaur, and a closely related species, still living, which could serve as a surrogate_mother.

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