单项选择题
A)The overall polt. B)The character development.
C)The boring writing. D)The act of the actor..
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单项选择题
A)The sun’s light. B)The mirror.C)The fire. D)The torch.
A.
C)The
B. -
单项选择题
核纤层蛋白（lamin）是（）。
A．一个具有多成员的蛋白家族
B．核纤层蛋白表达并不具有组织特异性
C．核纤层蛋白具有激酶活性，可以直接磷酸化MPF（metaphase promoting factor）
D．核纤层蛋白参与细胞凋亡过程
E．以上答案都不对 -
单项选择题
根据下列文章,请回答 41～45 题。 Giving Up Smoking A numberof devices are available to help a person quit smokin9。Nicotine(尼古丁)patches aresmall，nicotine—containing adhesive(粘着性的)discs applied to the skin．The nicotine isslowly aborted through the skin and enters the bloodstream(血流)．Over time。thenicotine dose is reduced and eventually the desire for nicotine is eased．Nicotinegum(口香糖)works in a similar manner, providing small doses of nicotine when chewed(咀嚼)．Thebenefits of giving up smoking include the immediate reduction of harm to the healthof the smoker and easier admission to social activities and institute ions thatban smoking．In a l988 report，the U.S．Surgeon General declared cigarette smokingto be more harmful and expensive than the use of cocaine(可卡因)alcohol．or heroin。Recentevidence supports this claim．TheUnited States government has collected a special tax on cigarettes for several decades．Therate rose from 8 cents per pack of 20 cigarettes in 1951 t0 24 cents per packin 1993．In other developed countries，the cigarette tax rate is much higher,ranging from 50 percent in Swaziland to 85 percent in Denmark．In the UnitedStates。the first direct action to check smoking was the regulation of a warningon cigarette packages by the Federal Trade Commission．This warning took effect in1964 and was strengthened in 1969 to read：'Warnin9：The Surgeon General HasDetermined That Cigarette Smoking IS Dangerous 10 Your Health．”in 1971 cigaretteadvertising was banned from radio and television，and cities and states passed lawsrequiring nonsmoking sections in public places and workplaces．第41题：Which of the following can help a personquit smoking?A．reading cigarette advertisements．B．Using nicotine patches．C．Chewingordinary gum．D．Participating in social activities．
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