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I'm taking a test and have to guess the right answer to the question after the article. Article: Picture the scene: the battery on your mobile phone has run out. You can't make any calls for help and no one can contact you. You are all alone - well, not quite. Just reach into your pocket and take out a piece of sugar.Put it into the battery, wait a minute, and you're back on the phone. Thanks to a couple of American scientists, this situation could become real.Swadesh Chaudhuri and Derek Lovely have invented the "bacteria battery" - powered by bacteria that eats sugar and turns it into electricity. "This is a special organism," Lovely said."You ean harvest enough electricity to power a cell phone battery for about four days from a spoonful of sugar." In the past, bacteria batteries have been expensive and not long-lasting. But this battery uses more efficient bacteria that can turn 80 percent of sugar into electrical energy. This is 30 percent more than similar batteries can manage. The bacteria battery could become as small as a household battery. It's also cheap and stable, as sugar can be taken from waste and crops. But the sugar to electricity process is slow: it could take weeks for the bacteria to digest a cup of sugar.And it produces "greenhouse" gases which pollute the environment. The scientists understand there is a lot more work to be done. "It is still young," said Lovely."Where we are now is where solar power was 20 0r 30 years ago." But he believes the battery could be used in scientific equipment at the bottom of the ocean.Other ideas include using sugar in the blood to run medical devices in the human body, and taking sugar from animal waste to provide energy to power homes in rural areas. Question: This passage is mainly about _ . Options: A: how to change sugar into electricity B: a scientific invention of a new kind of bacteria battery C: a new way to reduce pollution caused by mobile phones D: a new kind of mobile phones and its future
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B

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I'm taking a test and have to guess the right answer to the question after the article. Article: My elder brother Steve, in the absence of my father who died when I was six, gave me important lessons in values that helped me grow into an adult. Steve taught me to face the results of my behavior. Once when I returned in tears from a Saturday baseball game, it was Steve who asked me what happened. When I explained that my baseball had soared through Mrs. Holt's basement window, breaking the glass with a crash, Steve encouraged me to admit to her. Although my knees knocked as I explained to Mrs. Holt, I offered to pay for the window from my pocket money if she would return my ball. I also learned from Steve that personal property is a sacred thing. After I found a shiny silver pen in my fifth-grade classroom, I wanted to keep it, but Steve explained that it might be important to someone else in spite of the fact that it had little value. He reminded me of how much I'd hate to lose to someone else the small dog my father made with a piece of cheap wood. I returned the pen to my teacher, Mrs. David, and still remembered the smell of her perfume as she patted me on the shoulder. Yet of all the instructions Steve gave me, his respect for life is the most unforgetful in my mind. When I was twelve I killed an old brown sparrow in the yard with a BB gun. Excited, I screamed at Steve to come and take a look. I shall never forget the way he stood for a long moment and stared at the bird on the ground. Then in a dead, quiet voice, he asked, "Did it hurt you first, Mark?" I didn't know what to answer. He continued with his eyes firm, "The only time you should even think of hurting a living thing is when it hurts you first, and then you think a long, long time." I really felt terrible then, but that moment stands out as the most important lesson my brother taught me. Question: When Mark admitted his mistakes to Mrs. Holt, he _ . Options: A: was surprised B: felt frightened C: was light-hearted D: cried before her
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B

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I'm taking a test and have to guess the right answer to the question after the article. Article: I attended a birthday party in 1991. My teacher was then 59 years old. But her fellow teacher said that we were celebrating her 39thbirthday! We were all surprised and puzzled. After the party I was told by the fellow teacher that American women have a special saying about birthdays. If a woman is over 40, or even if she is 80, her birthday is always the 39th. If she is in her thirties, her birthday will be the 29th. And in her twenties, it's the 19th. They usually have their "real" birthday when they are below 20. This shows that American women, especially elderly women, are very sensitive about their ages. But my teacher always says, "We want to be younger," so about the age of Western women, my advice is that if you don't know it, don't ask about it; if you really know it, don't mention it. Question: The writer must be from _ . Options: A: Western countries B: Eastern countries C: China D: the United States
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B