| Mark Twain once observed that giving up
smoking is easy. He knew, because he’d done it hundreds of times himself. Giving
up for ever is a trifle more difficult, apparently, and it is well known that it
is much more difficult for some people than for others. Why is this
so 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 N 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. [单项选择]Mark Twain wrote all the following works EXCEPT
[A] The Adventures of Tom Sawyer. [B] The Adventures of Huckleberry Finn. [C] Life on the Mississippi. [D] Uncle Tom’s Cabin. [单项选择]
Mark Twain once observed that giving up smoking is easy. He knew, because he’d done it hundreds of times himself. Giving up for ever is a trifle more difficult, apparently, and it is well known that it is much more difficult for some people than for others. Why is this so [填空题]Mark Twain seemed unhappy in his later years because his wife and ______ had died.
[填空题]Mark Twain became the most outstanding writer of his time because he knew his people and the Missis sippi River very well, and he inherited from his mother ______.
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