user: Article: For years scientists have been worried about the effects of air pollution on the earth's natural conditions. Some believe the air inside many houses may be more dangerous than the air outside. It may be one hundred times worse. Indoor air pollution can cause a person to feel tired, to suffer eye pain, headache and other problems. Some pollutants can cause breathing disorders, diseases of blood and even cancer. Most scientists agree that every modern house has some kind of indoor pollution. People have paid more attention to the problem now. It is true that when builders began making houses and offices they did not waste energy. To do this they build buildings that limited the flow of air between inside and outside. They also began using man-made building materials. These materials are now known to let out harmful gases. As the problem became more serious, scientists began searching for a way to deal with it. They discovered a natural pollution control system for building--green plants. Scientists do not really know how plants control air pollution. They believe that a plant's leaves absorb or take in the pollutants. In exchange the plant lets out oxygen through its leaves and tiny organizations on its roots. Scientists suggest that all buildings should have one large plant or several small plants inside for every nine square meters of space. Studies of different plants show that each absorbs different chemicals. So the most effective way to clean the air is to use different kinds of plants. Having green plants inside your house can make it a prettier and healthier place. Question: Generally speaking, indoor air pollution may be more harmful than the air outside because  _  . Yes or no, is the answer "man-made building materials give off dangerous gases"?
No


(Question)
Article: Alaska polar bears are losing their fur and U.S. Geological Survey scientists don't know why. In the past two weeks, nine of 33 bears checked by scientists in the southern Beaufort Sea region near Barrow were found to have alopecia -- loss of fur, said Tony DeGange, chief of the biology office at the USGS Science Center in Anchorage. Three of four bears inspected Thursday near Kaktovik showed the symptoms as well. Scientists have been collecting blood and tissue samples from the suffering bears, but they do not know the cause or the significance of the outbreak, the Anchorage Daily News reported. "Our data set suggests that this is unusual but not unprecedented," DeGange said. Ten of 48 bears checked by the team in 1998-1999 had a similar condition, he said. In a long-standing project, the USGS has sent polar bear research teams to the area since 1984. The teams track and examine the bears to help determine their general health and habits. This year they saw their first bear with hair loss on March 21. The team will end up this year's operations in May when the sea ice becomes too dangerous for safe travel. "We took biopsies   in 1999 and couldn't establish a causative agent for the hair loss then," DeGange said. "But now we have this unexplained death event going on with seals  . And they haven't been successful in figuring out what caused the seal deaths. Is it just a matter of coincidence or is it related? We don't know." In December 2012, the National Oceanic and Atmospheric Administration declared an "unusual death event" based on a number of ringed seals found on beaches on the Arctic coast of Alaska during the summer. Dead and dying seals were found to have hair loss and skin sores. Affected seals were later observed in Canada and Russia. Question: What is the purpose of the project USGS has been doing since 1984? Yes or no, is the answer "To find out the bears' physical condition and living habits."?
(Answer)
Yes


Ques: Article: What time of day can you think most quickly? Are you a morning person? Or does it take you a few hours to get your brain going? A lot of recent research suggests that we should pay attention to our body clock. It can tell us what time of day we can perform best at. Many people work best later in the morning. This is because the body's temperature takes time to rise through the day. Taking a warm shower when you wake up can help your body's temperature rise quickly. But everyone's body clock is different and some are special. Morning people will get up early and work better early in the day. Evening people will work later but work better towards the end of the day. Research shows that we're better at some activities at certain times of the day. Physical performance is at its best between 3 pm and 6 pm, so it's better to exercise later in the day. Between noon and 4 pm, people begin to pay less attention. This is because we think less quickly after a big meal. Research also shows we become sleepy around 2 pm. This is why people in Spain take a short sleep in early afternoon.  Finally, it is best to eat when we're active. This allows our body to burn calories better and stops our blood sugar levels from getting too high. Question: What is the best title for this article? Yes or no, is the answer "The perfect time to do something"?
Ans: No


Article: Is it necessary for a young man to have an apartment as a prerequisite  for marriage? Housing has become a major obstacle  for Chinese young men hoping to start a family. China may breed a new group of bachelors, men caught in the trap of unaffordable houses. Since early 2009, the housing market has once again become a hot pot at boiling point. Even with allowance  and special government policies, home prices in China's first-tier cities such as Beijing and Shanghai are riding the crest of a rising wave. According to the "2010 China Marital Status Report" released on Dec 15, 2010, about 70 percent of women interviewed said that housing, a stable income and some savings were the main requirements for marriage. From the report, we can see that housing is given top priority  and that women see an apartment as essential  to show that the man is responsible and can provide for his family. Personality and morals lay outside the top three matrimonial  requirements. Some women and their families hold the traditional position and take it for granted that the home issue should be the man's responsibility, which doesn't agree with the contemporary independent spirit of women and gender equality. These marriage values reflect the fact that many women consider marriage another form of "social welfare". Things may be different overseas. Social housing, provided by European authorities, offer the less wealthy people their own piece of real estate. Such housing is usually apartments in tall buildings with 10 or more floors on the _ of town, whose main advantage is the low rents. For many Americans, houses don't pose an obstacle to getting married. They often buy a house after the wedding, because more and more people are reconsidering their real estate worship, and going back to a more rational  mode of consumption. In Japan, renting is the custom for newly married young couples. Few young couples can afford to purchase property. Up to 67.1 percent of young couples choose to rent. Generally speaking, renters account for most... Question: The author uses the examples of European countries, America and Japan to show that   _  ? Yes or no, is the answer "the situation is different in some foreign countries"?


assistant: No