In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". Do not generate anything else apart from one of the following characters: "A", "B", "C", "D". There is only one correct answer for each question.

[Q]: Article: Our planet is in trouble.Polluting industries and corporations are destroying our planet, resulting in increasing global temperatures, melting ice caps, and economic turmoil .All across the country, folks are waking up to the reality that if they do not ad now to solve the environmental problems of today, the consequences are unthinkable.If we don't i ct now, who will? Fortunately, an amazing team of young leaders are taking action.They a e getting involved with the Greenpeace Student Network! The Student Network has student leaders who deal with the most pressing environmental issues.We have organized and won inspiring campaigns.Convincing corporations to change their ways and politicians to do the right thing.All thanks to our team of leaders, known as Campus Coordinators. Campus Coordinators are located all across the United States, and even Canada! They work on Greenpeace Student Network campaigns at their schools and in their communities.They organize events like film screenings and days of action.They hold meetings with elected officials, work with the media, recruit volunteers, and mobilize their campus to take action! They do all of this with excellent training and expert support from our team of Student: Network staff.Campus Coordinators develop their leadership skins and become an unstoppable force for green solutions on pus and in their community. Currently, the Greenpeace Student Network is campaigning to solve the largest environmental threat to humankind: global warming.With only months until a new international treaty on global warming is decided this December, the time to stand up and take the lead has never been more important, If you are concerned with environmental issues, want to mobilize your scho4l and community, nd are ready to become a skilled organizer and strong leader, then the Campus Coordinator position is for you! We are now accepting applications for the Fall 2009-Spring 2010 academic year. Are you ready to be a leader on your campus? Apply to be a Campus Coordinator today!
Question: Why does the author write the passage?
Options: (A) To describe the serious environmental problems. (B) To call on students to apply to be Campus Coordinators, (C) To explain the advantage of the Greenpeace Student Network.. (D) To stress the importance of solving environmental problems.
[A]: B

[Q]: Article: The world's population is more mobile today than ever before. In 2010, more than 200 million people left their home countries to live in a new country. This is about 3 percent of the total world population. Some experts believe that number will swell to 400 million by 2050. Rates of immigration have remained strong for the last 300 years, but patterns of immigration have changed since World War II. The backgrounds and experiences of today's immigrants are different from those of the typical European immigrant of the nineteenth and early twentieth centuries. Contemporary immigrants range from unskilled laborers to highly skilled professionals, and they come from and go to countries all over the world. In the nineteenth century and until World War II, immigration was primarily in one direction- from the Old World to the New World. This is no longer the case. Countries such as Russia and China, which have long been, and continue to be, significant source countries, are now also destination countries. There is also considerable mobility inside regions, such as from one European country to another, or among the countries of the former Soviet Union. In spite of such differences, the push and pull factors for immigration remain essentially the same as they were 100 years ago. Most people move to another country because they want a better life. For the majority of immigrants, this means better economic conditions. As in past generations, a labor shortage in one country often draws workers from another country, especially if wages are significantly higher. In some small countries, for example, Qatar, United Arab Emirates, and Kuwait, there are more jobs than citizens. The demand for labor is so high that the majority of the population consists of foreign-born workers, ranging from highly skilled engineers and financial experts to domestic and construction workers. In traditional destination countries, such as the United States, however, labor needs have changed. Today, although there is still demand for unskilled labor, there is increasing demand for people with a high level of skill and education. The need for less skilled labor has shifted to other countries. As work on farms and in industry in the United States and Canada once drew workers from all over the world, now work in factories in Taiwan and south Korea attracts workers from Vietnam, the Philippines, and Cambodia. Most global immigration is legal: however, a large number of people also move across national borders illegally in pursuit of employment. Experts estimate that about 15 to 20 percent of immigrants worldwide are in their new countries illegally. The United States has the largest number of these immigrants, followed by South Africa, with significant numbers also in Northern and Western Europe and Mexico. These immigrants face particular challenges because they often must hide from the authorities who might deport them back to their home countries. Their illegal status also means that employers may take advantage of them by forcing them to work longer hours and paying them less than the legal minimum wage. Although economics remains the most important motivation in all forms of immigrant, other factors are also important. Some people decide to leave their home countries because their actions or political beliefs make it dangerous for them to remain. Others choose to leave because their home country has become too dangerous and unstable, often because of war or political unrest. They wish to find a place that is secure for themselves and their families. Education is also a significant factor for many modern immigrants. They want to raise their children in a place where they can get a good education, which, in turn, they hope will provide them with better prospects for the future. Finally, family and community ties also play a role in immigration decisions. As in the past, once a group of people from one country establishes a community in a new country, more people from that country is likely to follow. The pattern, direction, and rate of immigration may change as the global economy changes. However, as long as life in a new country is more attractive than life in the old country, immigration will continue.
Question: According to the reading, what are the patterns of immigration in China and Russia today?
Options: (A) Many people leave these countries while many people also immigrate to them. (B) They are major source countries for immigration. (C) They are major destination countries for immigrants. (D) Some people immigrate to these countries but many more people leave them.
[A]: A

[Q]: Article: Since ancient times, people have known about its ability to reduce pain and high body temperature. More than 2000 years ago, the Greek doctor Hippocrates advised his patients to chew on the bark and leaves of the willow. The tree contains a chemical called salicin . From salicin, researchers in the 1800s discovered how to make salicylic acid . And in 1897, a chemist named Felix Hoffmann at Friedrich Bayer and Company in Germany created acetyl salicylic acid. Later it became the active substance in a new medicine that Bayer called aspirin. The "a" came from acetyl. The "spir" came from the spirea plant, which also produces salicin. And the "in" Well, that is a common way to end medicine names. In 1982, a British scientist shared the Nobel Prize in Medicine in part for discovering how aspirin works. Sir John Vane found that aspirin blocks the body from making natural substances called prostaglandins .Prostaglandins have several effects on the body. Some cause pain and the expansion, or swelling( ; ), of damaged tissue. Others protect the lining of the stomach and small intestine. Prostaglandins also make the heart, kidneys and blood vessels work well. But there is a problem. Aspirin works against all prostaglandins, good and bad. Scientists learned how aspirin interferes with an enzyme . One form of this enzyme makes the prostaglandin that causes pain and swelling. Another form of the enzyme creates a protective effect. So aspirin can reduce pain and swelling in damaged tissues. But it can also harm the inside of the stomach and small intestine .
Question: What sickness can the medicine from the willow deal with according to the passage?
Options: (A) Cold (B) Toothache (C) Cancer (D) Skin disease
[A]:
B