Directions: In thissection,you will hear two long conversations.At the end of each conversation, you will hear some questions. Both the conversation and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D. Then mark the corresponding letter on the Answer Sheet with a single line through the centre. Questions 1 to 4 are based on the conversation you have just heard. 1、 A. The collection of precious metals. B. A standard measuring weight unit. C. The value of precious metals. D. A new metric system of measurement. 2、 A. Checking the accuracy of scales. B. Calculating the density ofmetals. C.Observing humidity of atmosphere. D.Measuring amounts of rainfall. 3、 A. It has been rusty. B. It was not scientific. C. It was of low quality. D. It was out of date. 4、 A. It is very cheap. B. It is difficult to say. C. It is too expensive. D. It is reasonable. Questions 5 to 8 are based on the conversation you have just heard. 5、 A. She is busy writing a biological article. B. She is busy with a program about endangered species. C. She is busy reading some books on economics. D. She is busy with two research papers. 6、 A. Some species are impossible to conserve. B. People are less conscious of saving endangered species. C. Funds are difficult to get to conserve endangered species. D. It is difficult to determine which animals are endangered. 7、 A. The relatives of the tailed toad have been extinct. B. The varieties of the tailed toad are helpful to the research ofevolution. C.If the tailed toad is well conserved,many other species will be better saved. D.If the tailed toad was extinct,some myth about evolution would lose. 8、 A. The man is busy preparing the research paper. B. The woman should hand two papers in on the same day. C. The man is reading a hook only about biology. D. The woman is glad to make a decision on which animal to save.