I'm taking a test and have to guess the right answer to the question after the article. Article: A new study links heavy air pollution from coal burning to shorter lives in northern China. Researchers estimate that the half-billion people alive there in the 1990s will live an average of 5 years less than their southern counterparts because they breathed dirtier air. China itself made the comparison possible: for decades, a now-discontinued government policy provided free coal for heating, but only in the colder north. Researchers found significant differences in both _ pollution of the air and life expectancy in the two regions. While previous studies have found that pollution affects human health, "the deeper and ultimately more important question is the impact on life expectancy," said one of the researchers, Michael Greenstone, a professor of environmental economics at Massachusetts Institute of Technology. "This study provides a unique setting to answer the life expectancy question because the(heating) policy dramatically changes pollution concentrations ,,,Greenstone said in an email. "Further, due to the low rates of migration in China in this period, we can know people's exposure over long time periods," he said. The policy gave free coal for fuel boilers to heat homes and offices to cities north of the Huai Rivwhich divides China into north and south. It was in effect for much of the 1950-198,0 period of central planning, and, though discontinued after 1980, it has left a legacy in the north of heavy coal burning, which releases particulate pollutants into the air that can harm human health. Researchers found no other government policies that treated China's north differently from the south. The researchers collected data for 90 cities, from 1981 to 2000, on the annual daily average concentration of total suspended particulates. In China, those are considered to be particulates that are 100 micrometers or less in diameter, sent out from sources including power stations, construction sites and vehicles. Among them, PM2.5 is of especially great health concern because it can go deep into the... Question: It is implied in the passage that _ * Options: A: coal is no longer used for heating in North China B: air quality was comparatively better in South China C: southerners burned coals for heating in the 1980s D: people preferred to live in South China after 1980
B

I'm taking a test and have to guess the right answer to the question after the article. Article: Nicole Delian, 17, suffers from a condition that makes her sleep up to 19 hours a day and as much as 64 days in a row. Nicole Delian is tired of sleeping. This 17-year-old teenager from North Fayette, Pa., has a rare condition called Kleine-Levin Syndrome -- or "Sleeping Beauty Syndrome" -- that makes her sleep 18 to 19 hours a day. And when she does wake up, she is often so tired out that she is in a sleepwalking state and doesn't remember doing basic things like eating, according to KDKA-TV. Nicole's sleepwalking state has been so severe that she once slept through the holidays, awaking one day in January when she finally opened Christmas gifts alongside her family, according to ChartiersValley.Patch.com. . "She's never really adjusted to it," her mother, Vicki Delien told the website. "She's 17 now and it really upsets her. She's missed out on a lot." Delien told talk show host Jeff Probst that the teen has at times slept 32 to 64 days in a row, waking only in sleepwalking mode to eat. Kleine-Levin Syndrome is incredibly rare, only affecting about l,000 people worldwide, and very hard to diagnose. In Nicole's' case, it took 25 months for doctors to diagnose her, according to ChartiersValley.Patch.com, and everything from a virus, to epilepsy to West Nile was mentioned, including, unfortunately, the possibility she was faking it for attention.. When a typical episode of Sleeping Beauty Syndrome begins, the patient becomes progressively drowsy and sleeps for most of the day and night, waking only to eat or go to the bathroom, according to the Klein-Levin Syndrome Foundation website. "When awake, the patient's whole behavior is changed, often appearing "stupid" or childlike. When awake he experiences confusion, complete lack of energy, and lack of emotions." Patients also report that everything seems out of focus, and that they are hypersensitive to noise and light. Some patients also have intense food cravings . The Delians did not say whether Nicole has experienced these symptoms. There is no... Question: According to the passage, Nicole_. Options: A: was once suspected of lying about her condition B: has a good appetite for food because of the disease C: has adapted to the condition and can well cope with it D: will be cured of the disease by using the combined medication
A

I'm taking a test and have to guess the right answer to the question after the article. Article: Living in the wild can be hard. Finding food and staying safe aren't easy. Each day, animals struggle to survive in their habitats. Not all animals get by on their own. Some animals form a close partnership with other kinds of animals. These pairings are called symbiotic relationships. In a symbiotic relationship, the animals depend on each other. One animal helps the other meet its needs. Sounds good, right? Not always. Some animals are not very kind to their partners. In some cases, one animal meets its needs but hurts its partner. Take ticks, for example. These insects suck blood to live. To get blood, they attach themselves to other kinds of animals. Ticks can pass germs that cause disease instead of helping their hosts. In other relationships, animals don't treat their partners so poorly. Both animals benefit from living with the other animal. Small animals called cleaner shrimps have found a way of helping fish at coral reefs. As their name suggests, the shrimps clean the fish. They hang out at what scientists call a cleaning station. A fish stops by. Then a shrimp climbs onto the fish and even steps into the fish's mouth. The shrimp uses its tiny claws to pick stuff off the fish's body. That can include dead skin, tiny pieces of food, and wee creatures that can hurt the fish. The fish gets a nice cleaning. The shrimp enjoys a tasty meal of fish trash. Small birds called plovers are also in the cleaning business. They have big customers-crocodiles. Crocs have long snouts filled with sharp teeth. Cleaning them is tricky. When a croc opens its mouth, the plover hops right in. The croc does not snap its snout shut.Instead, it lets the plover eat small, harmful animals attached to the crocodile's teeth. The plover gets an easy meal while the croc gets clean teeth. Question: Why do the cleaner shrimps clean the fish? Options: A: To get fish trash for food. B: To eat wee creatures. C: To help fish go out of coral reefs. D: To get food for fish.
A