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Article: XI'AN - China has introduced various emergency responses and long-term measures against air pollution in the central and eastern regions. The air quality index (AQI) for Xi'an reached 500 on Wednesday afternoon, at the top of the AQI scale, according to the national air quality monitoring website. Xi'an weather forecasters predict the smog will continue for the next week and air pollution may worsen. "I have to keep buying masks for my family," said Liu, buying masks at a pharmacy near her home in downtown Xi'an. "This is the only thing we can do to protect ourselves." On Wednesday, a city government emergency response plan was put into action, _ all construction and taking at least 50 percent of government vehicles off the road. Power plants must limit their output and reduce emissions. Nearly half the country, more than 100 cities in 20 provinces, has suffered from smog since last December. Many have taken action, including experimenting with artificial methods to reduce smog, limiting vehicle use and fining polluters. Assessments based on GDP alone were abandoned last month and more emphasis has been put on public well-being and the environment. Whether the move will be effective in forcing local governments consider environmental issues over economic growth remains to be seen. Environmental protection professionals are doubtful about the immediacy of the effects of these measures. Xiao Hang, an urban researcher at the Chinese Academy of Sciences, said it took London 50 years to lose the moniker "foggy London town", and Los Angeles still struggles to control its photochemical smog. "We can't ignore environmental problems during the development process and China has a long way to go," he said. Question: What Xiao Hang said indicates _ . Yes or no, is the answer "solving environmental problems requires great effort"?
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No

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Article: There are many theories about the beginning of drama in ancient Greece. The one most widely accepted today is based on the assumption that drama came from ritual . The argument for this view goes as follows. In the beginning, human beings viewed the natural forces of the world, even the seasonal changes, as unpredictable, and they sought through various means, to control these unknown and feared powers. Those measures which appeared to bring the desired results were then kept and repeated until they hardened into fixed rituals. Eventually stories arose which explained the mysteries of the rites. As time passed some rituals were abandoned, but the stories, later called myths , coutinued to exist and provided material for art and drama. Those who believe that drama came from ritual also argue that those rites contained the seed of theater because music, dance, masks, and costumes were almost always used. Furthermore, a suitable site had to be provided for performances and when the entire community did not participate, a clear division was usually made between the "acting area" and the "watching area." In addition, there were performers, and, since considerable importance was attached to avoiding mistakes in performing, religious leaders usually undertook that task. Wearing masks and costumes, they often imitated other people, animals, or supernatural beings, and used gestures about the desired effect, success in hunt or battle, the coming rain, the revival of the Sun. Eventually such dramatic representations were separated from religious activities. Another theory traces the theater's origin from the human interest in storytelling. According to this view, tales about the hunt, war, or other feats are gradually added in detail, at first through imitation, action, and dialogue by a narrator and then through the assumption of each of the roles by a different person. A closely-related theory traces theater to those dances that are primarily rhythmical and gymnastic or that are imitations of animal movements and sounds. Question: What does the passage mainly discuss? Yes or no, is the answer "The origins of theater."?
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No

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Article: A flock of hungry pigeons were flying across the sky in search of food. Having traveled a long distance, they felt tired and settled down on a tree. Just below the tree, they saw grains strewn all over the ground. The pigeons were happy to have found enough food to eat. All the pigeons came down from the tree and started eating the grains. As they were doing so, a huge net fell on them and trapped them all. The pigeons were taken aback. They noticed a hunter sitting at a distance from the tree, a bow and arrow in hand. The pigeons realized it was the hunter who had trapped them in the net. The hunter got up and began to move towards the pigeons. The leader of the pigeons spoke, "Friends, we are in great trouble. The hunter will catch us if we do not act swiftly in a few seconds. There is only one _ available at this moment. Let all of us use our force together and fly up along with the net. If all of us use our force and fly together, we can fly carrying the net along with us. Let us start now." All the pigeons agreed with him and flew high carrying the net along with them. After traveling enough distance away from the hunter, the pigeons settled on a tree and carefully came out of the net one by one and thus escaped the evil design of the hunter. Question: This story wants to tell us that _ Yes or no, is the answer "teamwork can work wonders."?
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No