单选题Nowadays, air travel is very 1 . We are not surprised when we watch on TV that a politician has talked with French President in Paris and attended a meeting in Beijing on the same day. 2 , if a person takes long-distance flying frequently, he can be so tired that he maybe feel his brain is in one country, his 3 in another. 4 , he 5 knows where he is. When we fly from east to west or 6 versa, the 7 we experience after taking a long-distance flying is 8 , because we cross time zones. According to doctors, air travelers, after crossing several time zones, are in no 9 to go to work, and they should go 10 to bed 11 arrival. As to airline pilots who often live 12 their own watches and ignore local time, there is no need for them to worry about their health although they sometimes have breakfast at midnight, because they are used to 13 and are 14 fit. Many businessmen like long-distance flights, thinking they are 15 to have been chosen and they are out for promotion. They are lucky if the company follows the doctor"s advice and allow them to rest for a day or two 16 working. However, sometimes the manager is so energetic that he believes everyone is 17 to be as fit as he is. Since he has never felt 18 after flying himself, the work he assigns is so 19 that the employee is too 20 to carry the work out satisfactorily. That is disastrous for the employee"s health and the company"s reputation.

单选题From what the author said in Para. 1, it can be inferred that.

单选题We all know that DNA has the ability to identify individuals but, because it is inherited, there are also regions of the DNA strand which can relate an individual to his or her family (immediate and extended), tribal group and even an entire population. Molecular Genealogy (宗谱学) can use this unique identification provided by the genetic markers to link people together into family trees. Pedigrees (家谱) based on such genetic markers can mean a break-through for family trees where information is incomplete or missing due to adoption, illegitimacy or lack of records. There are many communities and populations which have lost precious records due to tragic events such as the fire in the Irish courts during Civil War in 1921 or American slaves for whom many records were never kept in the first place. The main objective of the Molecular Genealogy Research Group is to build a database containing over 100,000 DNA samples from individuals all over the world. These individuals will have provided a pedigree chart of at least four generations and a small blood sample. Once the database has enough samples to represent the world genetic make-up, it will eventually help in solving many issues regarding genealogies that could not be done by relying only on traditional written records. Theoretically, any individual will someday be able to trace his or her family origins through this database. In the meantime, as the database is being created, molecular genealogy can already verify possible or suspected relationships between individuals. "For example, if two men sharing the same last name believe that they are related, but no written record proves this relationship, we can verify this possibility by collecting a sample of DNA from both and looking for common markers (in this case we can look primarily at the Y chromosome (染色体)," explains George Green, a member of the BYU Molecular Genealogy research team.

单选题What did Group A do in their program?

单选题We can learn from the passage that the two talk shows _________.

单选题ThethreeAmericanofficialsarrivinginBaghdadA.wereallowedtoworkunimpeded.B.wereforbiddentoworkatall.C.wereaskedtoleave.D.werepromptlydetained.

单选题The author's attitude toward Richard Lamm's remark is of______.

单选题You will hear three dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each question by choosing A, B, C or D. After listening, you will have 10 seconds to check your answer to each question. You will hear each piece ONLY ONCE. Questions 11—13 are based on the following news.

单选题Hurricane Belle was noteworthy because ______.

单选题Questions 11-13 are based on the following talk.