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石某初中未毕业辍学，虚岁16岁，被某杂技团招为演员，并签订了为期2年的劳动合同，该合同无效。 ()
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Section B
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
Nineteenth-century writers in the United States, whether they wrote novels, short stories, poems, or plays, were powerfully drawn to the railroad in its golden years. In fact, writers responded to the railroads as soon as the first were built in the 1830's. By the 1850's, the railroad was a major presence in the life of the nation. Writers such as Ralph Waldo Emerson and Henry David Thoreau saw the railroad both as a boon to democracy and as an object of suspicion. The railroad could be and was a de spoiler of nature; furthermore, in its manifestation of speed and noise, it might be a despoiler of human nature as well. By the 1850's and 1860's, there was a great distrust among writers and intellectuals of the rapid industrialization of which the railroad was a leading force. Deeply philosophical historians such as Henry Adams lamented the role that the new frenzy for business was playing in eroding traditional values. A distrust of industry and business continued among writers throughout the rest of the nineteenth century and into the twentieth.
For the most part, the literature in which the railroad plays an important role belong to popular culture than to the realm of serious art. One thinks of melodramas, boys' books, thrillers, romances, and the like rather than novels of the first rank. In the railroads' prime years, between 1890and 1920, there were a few individuals in the United States, most of them with solid railroading experience behind them, who made a profession of writing about railroading --works offering the ambience of stations, yards, and locomotive cabs. There writers, who can genuinely be said to have created a genre, the "railroad novel, "are now mostly forgotten, their names having faded from memory. But anyone who takes the time to consult their fertile writing will still find a treasure trove of information about the place of the railroad in the life of the United States.
With which of the following topics is the passage mainly concerned？
A．He put it back on the ground.B．He put it into his own pocket.C．He threw it into a tr
A team of researchers has found that immunizing patients with bee venom instead of with the bees' crushed bodies can better prevent serious and sometimes fatal sting reactions in the more than one million Americans who are hypersensitive to bee stings. The crushed-body treatment has been standard for fifty years, but a report released recently said that it was ineffective. The serum made from the crushed bodies of bees produced more adverse reactions than the injections of the venom did.
The research compared results of the crushed-body treatment with results of immunotherapy that used insect venom and also with results of a placebo. After six to ten weeks of immunization, allergic reactions to stings occurred in seven of twelve patients treated with the placebo, seven of twelve treated with crushed body extract, and one of eighteen treated with the venom.
The word "fatal" in paragraph 1, sentence 1 is closest in meaning to ______.
A．When he was having dinner.B．When he was at the police station,C．When he was taking a
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