Read the following article and select the best answer. Article: Mark Twain has been called the inventor of the American novel. And he surely deserves additional praise: the man who popularized the clever literary attack on racism. I say clever because anti-slavery fiction had been the important part of the literature in the years before the Civil War. H. B. Stowe's Uncle Tom's Cabin is only the most famous example. These early stories dealt directly with slavery. With minor exceptions, Twain planted his attacks on slavery and prejudice into tales that were on the surface about something else entirely. He drew his readers into the argument by drawing them into the story. Again and again, in the postwar years, Twain seemed forced to deal with the challenge of race. Consider the most controversial, at least today, of Twain's novels, Adventures of Huckleberry Finn. Only a few books have been kicked off the shelves as often as Huckleberry Finn, Twain's most widely read tale. Once upon a time, people hated the book because it struck them as rude. Twain himself wrote that those who banned the book considered the novel "trash and suitable only for the slums ." More recently the book has been attacked because of the character Jim, the escaped slave, and many occurences of the word nigger. (The term Nigger Jim, for which the novel is often severely criticized, never appears in it.) But the attacks were and are silly--and miss the point. The novel is strongly anti-slavery. Jim's search through the slave states for the family from whom he has been forcibly parted is heroic. As J. Chadwick has pointed out, the character of Jim was a first in American fiction--a recognition that the slave had two personalities, "the voice of survival within a white slave culture and the voice of the individual: Jim, the father and the man." There is much more. Twain's mystery novel Pudd'nhead Wilson stood as a challenge to the racial beliefs of even many of the liberals of his day. Written at a time when the accepted wisdom held Negroes to be inferior to whites, especially in intelligence, Twain's... Question: What best proves Twain's anti-slavery stand according to the author? - Jim's search for his family was described in detail. - The slave's voice was first heard in American novels. - Jim grew up into a man and a father in the white culture. - Twain suspected that the slaves were less intelligent.
Jim grew up into a man and a father in the white culture.

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Read the following article and select the best answer. Article: Green invaders are taking over America. Not invaders from space, but plants! You might not think of plants as dangerous, but in this case they are threatening nature's delicate food chain. The invaders are plants brought here from other countries to make gardens and yards look pretty. Ever since people started to arrive on America's shores, they have carried along trees, flowers, and vegetables from other places. Now there are so many of those plants, they are crowding out the native plants that have lived here since before human settlers arrived. And that's a problem, says Dr. Doug Tallamy. He's insect expert at the University of Delaware. He explains that almost all the plant-eating insects in the United States are specialized, which means they eat only certain plants. Monarch butterfly caterpillars ,for example, dine on milkweed. If people cut down milkweed and replace it with another plant, the butterflies will not have the food source that they need to survive. But the trouble doesn't stop there. When insects can't get the right plants to eat and they die off, then the birds don't have enough bugs for their meals. Tallamy points out that almost all migrating birds depend on insets to feed their young. "We cannot let the plants and animals around us disappear." says Tallamy, "The way to preserve them is to give them food to eat. But when we plant non-native plants, we are _ the food chain, because then we don't have the insects the birds need to live." Fewer of the right plants mean fewer bugs, and fewer bugs mean fewer birds. And that's bad for the Earth, because we need a variety of living things to keep the planet healthy and beautiful. The good news is, garden centers sell native plants. "Just Google 'native plants' and your location, and you can find out which plants really belong where you live," says Tallamy Question: We can know whether a plant is native by _ . - Googling on the Internet - asking Dr. Doug Tallamy - looking up in books - searching in garden
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Googling on the Internet

Question: Read the following article and select the best answer. Article: A man was selling medicine at a fair .At first he sold bottles of a cure for colds for just a dollar a bottle. Many people wanted to buy it and the man's young assistant moved quickly through the crowd collecting money and handing out bottles of the cure. Then,when he had a big crowd, the man held up a very small bottle. "And now,ladies and gentlemen,he shouted,"Here is the medicine you have been waiting for.The cure for old age.Drink just one bottle of this and you will live forever. "And,ladies and gentlemen,the man continued,"I'm not going to charge(............)you a hundred dollars a bottle for this wonderful medicine.I'm not going to charge you fifty dollars a bottle.I'm not going to charge you twenty-five dollars a bottle.Now,ladies and gentlemen,I'm going to charge you just ten dollars a bottle. Think,my friends,for ten dollars you can live forever. Most of the people in the crowd did not believe this. One person shouted,"If it can make you live forever,why don't you drink it?Then another person cried,"Yes, you look as if you're at least sixty years old. "Thank you,sir,thank you,the man answered,"I'm so glad you said that. My real age is three hundred and twenty-nine. The crowd laughed at this but there were still some people who wanted to believe the man .One of them spoke to the man's assistant as she passed by,"Is that true?he asked."Is he three hundred and twenty-nine? "Don't ask me,the assistant said,"I've only worked for him for a hundred and fifty years. Question: What did the man sell at first at the fair? - bottles - a cure for colds - a cure for old age - a medicine that made people live forever
Answer:
a cure for colds