Read the following article and select the best answer. Article: Air pollution is a leading cause of cancer and classified among Group 1,or top, human carcinogens , said the International Agency for Research on Cancer (IARC), which is the World Health Organization's (WHO) cancer agency, on Oct 17,2013. The most widely used system for classifying carcinogens comes from the IARC, which places them into five groups. Group 1 carcinogens definitely cause cancer in humans. Group 2A is probably carcinogenic to humans, Group 2B is possibly carcinogenic, the carcinogenicity of Group 3 in humans is unclassifiable, and Group 4 is probably not carcinogenic to humans. Only a little more than 100 are classified as Group 1 cancer-causing substances, including ultraviolet radiation and tobacco smoke. "Our task was to evaluate the air everyone breathes rather than focus on specific air pollutants," the lARC's Dana Loomis said in a statement. "The results from the reviewed studies point in the same direction: the risk of developing lung cancer is significantly increased in people exposed to air pollution." In 2010, lung cancer resulting from air pollution killed 223,000 people worldwide, and there was also convincing evidence that it increases the risk of bladder cancer, according to the IARC. Air pollution is already known to raise risks for a wide range of illnesses, including respiratory and heart diseases. Air pollution is global, although the levels of it vary over space and time. Loomis said people in Asia, eastern North America, some places in Central America and Mexico, as well as North Africa have relatively high exposure. Developing countries with large populations and booming manufacturing sectors, such as China, are particularly at risk. Many cities in China, such as Beijing, frequently see smog. This week, Harbin, the capital city of Heilongjiang province, became the first Chinese city to officially suspend classes due to serious smog Many developed countries face similar problems, although to a lesser degree than most developing nations. In Europe, levels of many pollutants... Question: Why should the international community take action without further delay? - The composition and levels of air pollution vary from place to place. - More and more people in developing countries are exposed to air pollution. - Developed countries face air pollution, the level of which is higher than the safety limits. - A large number of people worldwide are exposed to air pollution.
A large number of people worldwide are exposed to air pollution.

Read the following article and select the best answer. Article: In communities north of prefix = st1 /Denver, residents are pitching in to help teachers and administrators as the Vrain school District tries to solve a $13.8 million budget shortage blamed on mismanagement . " We're worried about out teachers and principals, and we really don't want to lose them because of this," one parent said," If we can help ease their financial burden, we will." Teachers are grateful, but know it may be years before the district is solvent . They feel really good about the parent support, but they realize it's impossible for them to solve this problem. The 22,000-student district discovered the shortage last month. " It's extraordinary. Nobody would have imagined something happening like this at this level," said State Treasurer Mike Coffman. Coffman and district officials last week agreed on a state emergency plan freeing up a $ 9.8 million loan that enabled the payroll to be met for 2,700 teachers and staff in time for the holidays. District officials also took $ 1.7 million from student -activity accounts of its 38 schools. At Coffman's request, the District Attorney has begun investigating the district's finances. Coffman says he wants to know whether district officials hid the budget shortage until after the November election, when voters approved a $ 212 million bond issue for schools. In Frederick, students' parents are buying classroom supplies and offering to pay for groceries and utilities to keep first-year teachers and principals in their jobs. Some $ 36,000 has been raised in donations from Safeway. A Chevrolet dealership donated $ 10,000 and forgave the district's $ 10,750 bill for renting the driver educating cars. IBM contributed 4,500 packs of paper. " We employ thousands of people in this community," said Mitch Carson, a hospital chief executive, who helped raise funds." We have children in the school, and we see how they could be affected." At Creek High School, three students started a website that displays newspaper articles, district information... Question: Three high school students started a website in order to - attract greater public attention to their needs - appeal to the public for contributions and donations - expose officials who neglected their duties - keep people properly informed of the crisis
keep people properly informed of the crisis

(Q).
Read the following article and select the best answer. Article: Earthquake is not an unfamiliar word to us as it is frequently covered on the news report. However, I never have the idea that it will take place in my city. But the truth is that it happened. When the building began to shake, I thought it was dizziness caused by long-time nonstop work and colleagues also kept silent till one of them shouted, "The chair is shaking." Then we came to understand it was not personal feelings, and we started to find the reason--the weak foundation of the building, or earthquake (in a joking tone), but we still kept doing what was in hand. It was kind of _ when I looked back, because of our slow reaction and stupid response. It was said that the staff in another building next to us all ran out of the building with their handbags; some of them even drove away. On hearing that, I thought it was a bitexaggeration . Did they really have to do so? It was only 20-second mild shaking. But now, when I totally get to know what happened, I change my mind. It is not over-reacting, but natural self-protection response. Luckily it's only the aftershocks; otherwise I guess I would be frightened to death. The aftershocks make me think what I'm going to do in case of earthquake, which I would never give a second thought before. I don't know what's on their mind for people who are on the spot of the earthquake, be frightened, at a loss, or simply running away, or trying to get contact with friends or... It is hard to imagine the picture and even harder to imagine what's next. For the first time, I have the feeling of insecurity. Humans are so fragile when they face the sudden disasters. Question: Why did the author and his colleagues still keep working when the building began to shake? - Because they thought the earthquake was slight. - Because they thought the earthquake was just aftershocks. - Because they didn't take the shake seriously. - Because there were no signs of earthquake at that time.
(A).
Because they didn't take the shake seriously.