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Read the article and select the best answer. Article: Ashleigh Fraser and Leah Guskjolen, both 18, wondered why they would not be allowed to wear nail polish or artificial nails during their training to become certified nursing assistants. But when they asked, the only response which they got was that "rules are rules." Not satisfied, the teens decided to explore the issue themselves. For their new study, Ashleigh and Leah, seniors at Willcox High School in Willcox, Arizona., borrowed materials from the hospital where they had been trained as nursing assistants. Ten nurses there agreed to give them little scrapings off the top side of their nails. Half of the participants had natural nails. The other half wore nail polish or fake nails on top of their natural nails. The teens grew bacteria from the scrapings on plates; these are plastic dishes with a gel that feeds bacterial growth. Natural nails produced an average of 4.3 bacterial colonies. In contrast, scrapings from nail polish or artificial nails produced an average of 17.5 colonies! Leah and Ashleigh had their answer to the question. Only natural nails are allowed because polished or artificial nails tend to harbor far more bacteria. The germs could be dangerous to sick patients. Leah notes that they are not the first to look at nails in a medical setting. Still, she says, "It is something that should be taken much more seriously than it is." To emphasize that, she points to the large list of similar studies she and Ashleigh uncovered during their research. When nurses touch patients, they often wear gloves, but many small tasks are performed bare-handed. The teens hope to raise awareness of how dangerous artificial nails can be in the medical setting. "What shocked me," Leah says, "is how unconcerned some of the nurses were. They did not think their nails were dangerous." Ashleigh agrees and observes that to preserve their manicures , nurses with polish or fake nails tended to scrub less vigorously when washing their hands. Their nails might look nice, but this might contribute to the large... Question: What did the two teenagers do for their study? Options: A: They visited many top scientists. B: They consulted the hospital's nurses. C: They collected experimental samples at a school. D: They grew germs from the scrapings on dishes.
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D

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Read the article and select the best answer. Article: Earthquakes and volcanic eruptions usually cause the largest, most disastrous debris ( ) flows. A great many victims of the earthquake that struck Wenchuan of Sichuan province last May were killed not by the quake itself but by the sudden large amounts of debris that followed. Most debris flows occur where the soil is composed mainly of sand or colluviums ( ) . Loose soils made up of bits of sand or colluviums fall apart easily and are main material for fast -moving debris flows. Scientists have conducted endless experiments to find out how debris flows work. They have learned that the amount and the timing of water entering the soil are crucial ( ). Typically, that means debris flows often occur when a long rainy period of many weeks is followed by an intense, brief heavy rain. . More often than not, however, debris flows are started by water, in the form of rain, snow, or river flow. In 1998, heavy rains from Hurricane Mitch unleashed about one million tons of mudslides, burying thousands of people, in Central America. Water flows through the soil until it hits a hard layer of bedrock or clay. There the water builds up, filling the tiny spaces between the soil and rock. That buildup reduces the natural friction ( ) that keeps the rock and soil debris lying on the slope. If conditions are approaching dangerous levels, the slope will then fall down. Despite what scientist know about the fact, debris flows are still impossible to predict at present because there are many other uncertains affect the stability of each slope. However, one thing is known: On hillsides where one debris flow has occurred, another will eventually follow. The next debris flow could take days, weeks, or years to happen. Question: The passage is mainly about _ . Options: A: when and where debris flows occur B: the experiments that scientists conduct C: the causes of debris flows D: the possible ways to predict landslides
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C

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Read the article and select the best answer. Article: Here is some information about several famous local bakeries in Indiana, the US. They serve as a social gathering place for locals. Maple Lane Bakery At 8260 S. State Rd. Claypool, IN. (574) 566-2917, it offers a variety of cooked pies, cookies, and bread. With 20 years' experience Maple Lane Bakery has specialized in the making of pies. The menu includes peach pie $7.19, berry pie $ 7.70, apple pie $7.19 and banana pie $6.99. Feel free to place an order at least 24 hours in advance. Betty's cakes & Candy Shop At 816 E. Winona Avenue Warsaw, IN. (574) 269-1231, it specializes in cakes and offers cookies and candies. The chocolate cookies are sold at $ 8.99 a dozen. Betty's cakes & Candy Shop, started half a century ago, specializes in wedding cakes and birthday cakes. Buying a cake from Betty's will not disappoint you as they are always excellent. Crepes' Quality Bakery At 217S. Cavin Street Ligonier, IN.(260) 894-3024, this third generation bakery is located downtown Ligonier. It offers cookies and cupcakes, and specializes in rolls and bread. If you plan to buy cookies for the office or work area, you had better get there early as the building workers arrive just before 5:00 am waiting for the doors to open. Olympia Candy Kitchen At 136N. Main Street Goshen, IN. (574) 533-5040, it has been welcoming visitors for almost a century in its unchanged location in downtown Goshen, Indiana. Its tradition began in 1912 when Greek Nicholas began making his own chocolates. Today this family-owned operation offers all kinds of candies and boxed candies. If you need an order, you should call ahead of time to see if they can meet your request. Question: Which of the following bakeries has the shortest history? Options: A: Olympia Candy Kitchen B: Crepes' Quality Bakery C: Maple Lane Bakery D: Betty's cakes & Candy Shop
(Answer)
C