读写英语UNIT4答案.doc

Unit Four Practice Passage 1. 1. A; 2. D Passage 2. 1. C; 2. C Passage 3. 1. B; 2. C Passage 4. 1. C; 2. D ? Reading Selection One I.? 1. He is directing a project that combines old-fashioned genealogy with the latest technology in the hope of making it easier to fill out family trees. 2. First, volunteers donate their blood. Secondly, DNA from the blood is analyzed to create a map of genetic markers. Thirdly, scientists try to identify what genes residents in any place and at any time carry. 3. In Gaulin’s opinion, there are three major advances in geneology. The photocopier is the first, the next is the and the third one is DNA. 4. DNA is not only the guideline for pedigrees in the future but also another clue in the search for ancestors. 5. It is difficult to fulfill the research because the database needs samples from every region on every continent, which will cost tens of millions of dollars. 6. It intends to show that we’re essentially one big family. ? II.????? 1. donates/donated 2. query 3. ancestor(s) 4. volunteers 5. initial 6. decoding 7. submitted 8. offspring 9. sample 10. clue ? Reading Selection Two I.? 1. F 2. T 3. T 4. F 5. F 6. T 7. F 8. F 9. T 10. T ? II.????? 1.C 2.B 3.C 4.A 5.B 6.D 7.A 8.C ? Vocabulary Practice I.? evolution, organism, capacity, fragile, cells, ultimate, creation, conquer, organic, mechanical, durable, command II.????? 1. Modern technology makes it possible that artificial organs can replace the original fragile ones in the human body. 2. For the sake of convenience, you’d better duplicate the paper. 3.The government made considerable efforts to beautify the external environment of the city. 4. Albert Einstein has great talents to uncover the mythical universe. 5. His ultimate goal is to strive to become from a junior executive to general manager of the company. III.?? 1. cybernetically control 2. in one’s prime 3. suit one’s personal convenience 4. by ordinary standards 5. evolving from ape int