Why is third-hand smoke especially harmful to young children？

A . at all times B . during evening hours C . unless another person is present D . during drilling operatio

A . ARP B . ICMP C . OSPF D . BGP

A . am not sure B . have no idea C . do know D . did not know

A . fuel oil supply temperature is normal B . burner electrode is incorrectly positioned C . fuel／air ratio is incorrect D . ignition current is too low

A . low exhaust back pressure B . early fuel injection in one of the cylinders C . compression pressure in one of the cylinders D . plugged injector hole

A . 借助MPLS封装 B . 借助GRE封装 C . 借助ATM封装 D . 借助FR封装

A.give up B.sends up C.sends away D.sends out

A．If it has no ventilation systems. B．If it has a childcare facility. C．If it has no designated areas. D．If it is close to public areas.

M: It's the law here. They have to print it. Q: What are they talking about？ (14) A．People must give up cigarettes. B．A health warning on cigarette packs. C．The law doesn't allow people to smoke. D．Smoking can cause lung cancer.

A．linked to B．related with C．resulted in D．led to

A．Right. B．Wrong. C．Doesn't say.

A．instructed B．inquired C．forbidden D．strived

A．favorite B．alike C．favorable D．likely

A．watching TV. B．gathering with friends. C．doing chores. D．reading a book.

A、believes/ to B、believe/ for C、believes/ for D、believe/ to

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.

A．He isn't aware of the consequences of smoking. B．He believes that smoking helps to keep his figure. C．He's afraid of losing weight if he quits smoking. D．He thinks smoking can make him handsome.

A．It does put the health of young children at risk. B．It will remain harmful to children for two days. C．Its harm has been exaggerated by researchers. D．Most of the smokers know nothing about its harm.

A．Smoking is strictly forbidden B．Smoking is forbidden indoors C．They love smoking D．They are indifferent toward smoking