Mark Twain paid the young porter_________ he usually did for a porter for his helping them have two seats in the sleeping car.

A . small B . little C . few D . a few

A . half pound B . one pound and half C . one and a half pounds D . one and half a pound

A . to repair B . repair C . repairing D . repaired

A . the Hudson River　 B . the Mississippi River C . the Missouri River　 D . the transcontinental railway

A．Y B．N C．NG

A．Right B．Wrong C．Doesn't say

A．sense of humor B．egotism C．jokes D．tall tales

A．for B．to C．by D．on

A) metonymy B) simile C) metaphor D) synecdoche

A.As B.Once C.That D.It

A．The Gilded Age B．Adventures of Tom Sawyer C．The Innocents Abroad D．The Prince and the Pauper

A．The Prince and the Pauper B．On the Mississippi C．The Adventures of Tom Sawyer D．The Adventures of Huckleberry Finn

A．He danced out of the house. B．He walked out of the house. C．He hurried out of the house.

A、to smile B、smile C、smiled D、being smiled

Few doctors believe any longer that it is simply a question of will power. And for those people that continue to view addicts as merely "weak", recent genetic research may force a rethink. A study conducted by Jacqueline Vink, of the Free University of Amsterdam, used a database called the Netherlands Twin Register to analyze the smoking habits of twins. Her results, published in the Pharmacogenomics Journal, suggest that an individual's degree of nicotine dependence, and even the number of cigarettes he smokes per day, are strongly genetically influenced. The Netherlands Twin Register is a voluntary database that contains details of some 7,000 pairs of adult twins (aged between 15 and 70) and 28,000 pairs of childhood twins. Such databases are prized by geneticists because they allow the comparison of identical twins (who share all their genes) with fraternal twins (who share half). In this case, however, Dr. Vink did not make use of that fact. For her, the database was merely a convenient repository of information. Instead of comparing identical and fraternal twins, she concentrated on the adult fraternal twins, most of whom had completed questionnaires about their habits, including smoking, and 536 of whom had given DNA samples to the register. The human genome is huge. It consists of billions of DNA "letters", some of which can be strung together to make sense (the genes) but many of which have either no function, or an unknown function, To follow what is going on, geneticists rely on markers they have identified within the genome. These are places where the genetic letters may vary between individuals. If a particular variant is routinely associated with a particular physical feature or a behavior. pattern, it suggests that a particular version of a nearby gene is influencing that feature or behavior. Dr. Vink found four markers which seemed to be associated with smoking. They were on chromosomes 3, 6, 10 and 14, suggesting that at least four genes are involved. Dr. Vink hopes that finding genes responsible for nicotine dependence will make it possible to identify the causes of such dependence. That will help to classify smokers better (some are social smokers while others are physically addicted) and thus enable "quitting" programs to be customized. Results such as Dr. Vink's must be interpreted with care. Association studies, as such projects are known, have a disturbing habit of disappearing, as it were, in a puff of smoke when someone tries to replicate them. But if Dr. Vink really has exposed a genetic link with addiction, then Mark Twain's problem may eventually become a thing of the past. Mark Twain is mentioned in the passage in order to show that A．he is a man with very Strong will power. B．it is easy to give up smoking temporarily. C．famous writers are often heavy smokers. D．only few people have his determination.

As a young man, Twain held many jobs. He was a printer, a good miner, and, for a time, he was a riverboat pilot. During his pilot days, he adopted the name Mark Twain. This was a term used by the boatmen to mean that the water measured two fathoms, or twelve feet, which was deep enough for safe passage. Finally Twain became a successful writer. He traveled a great deal, writing and speaking, and became very popular both in the United States and in Europe. Twain's style. of writing was simple and direct. Among the things he wrote about were superstitious(迷信的)people and people who were easily fooled. He used his unusual gift for humor to write about many things of importance. Generally speaking, this article is about ______. A．a riverboat pilot B．a printer C．a gold miner D．a famous writer

A、It increases the net income by $3000 B、It decreases the net income by $3000 C、It increases the net income by $8000 D、It decreases the net income by $8000

此题为判断题(对，错)。

A．Tom Sawyer B．Huckleberry Finn C．Jim D．Tony