Q: Read the following article and select the best answer. Article: Contrary to people's previous knowledge, it's food shortage not dietary preference that motivates birds to migrate thousands of miles back and forth between breeding and nonbreeding areas each year, a new research shows. "It's not whether you eat insects,fruits or candy bars or where you eat them that counts,but how reliable that daytoday food source is," said the study leader W.Alice Boyle of the University of Arizona. To figure out the underlying pressure that drives some birds to leave home for the season,Boyle examined 379 related species of New World flycatchers and compared their sizes,food types, habitats, migratory behaviors and whether or not they fed in flocks. To compare the birds,the researchers constructed a "supertree" showing the exact evolutionary relationships among different species. A computer analysis then determined whether a particular species was migratory because it ran in the "family" or whether something in the bird's environment was forcing it to leave each season.Boyle and her colleagues found that food shortage was the number one issue that predicted a species' migratory behavior. "Food availability is the underlying pressure, not diet and habitat," Boyle said. An alternative strategy that the birds use to handle food shortage is to hunt in flocks, since a group is more likely to find a new source of food than an individual. "If you suffer from food shortage, you have two options," Boyle said."You can either hunt with other birds or you can migrate." Question: Birds were thought to migrate in order to _ . - seek their favorite food in a new place - avoid being constantly hunted - breed more young in a new place - adjust themselves to the changes of weather
A: seek their favorite food in a new place

Q: Read the following article and select the best answer. Article: Where Are We Going, Dad? has become one of China's most popular television shows, since its debut in October, averaging more than 600 million viewers each week. Sponsorship rights for the show's second season were sold for 312 million yuan (about $ 50 million), more than ten times higher than the rights to the first season. What accounts for its popularity? The show features a new generation of Chinese fathers, who, as part of the country's new middle class, have faced more problems with modern child-raising techniques such as taking an active role with their children. Part of the appeal of the show is the chance to throw a glance at the lives of Chinese celebrities and their children. Audiences are interested in watching the failed attempts of celebrity dads making dinner, doing hair, and disciplining children -- tasks often left to mothers in a society still influenced by the saying that "men rule outside and women are inside." "In traditional Chinese culture, fathers are strict and mothers are kind. But on the show, we see fathers who are much gentler on their kids and more involved in their upbringing, " said Li Minyi, an associate professor. "This show raises an important question for modern Chinese society -- what is the role of fathers in today's China?" After each episode goes to air, the Chinese internet explodes with comments on each celebrity's parenting style. Actor Guo Tao tries to communicate with his son, Shitou, but is seen as a more traditional Chinese father, and has been criticised online for being too _ . Zhang Liang, a supermodel, is an audience favorite for treating his son, Tiantian, more like a friend. The show's most famous celebrity, Lin Zhiying, a film star, was originally praised as patient with his son Kimi. But as the season progresses, fans begin to criticise him for raising a spoiled, undisciplined boy. Director Wang Yuelun is at a complete loss when it comes to care of his daughter's hair. Even the People's Daily is pleased with the success of the show. Question: According to the passage, the show _ . - gives audiences the chance to raise the star's children themselves - invites some famous film stars to take part in it - lets people think about the role of fathers in modern families - raises people's concern about women's role in the society
A: lets people think about the role of fathers in modern families

Q: Read the following article and select the best answer. Article: Most Chinese people don't understand why some westerners don't eat meat. In China, to eat meat is a sign of wealth. If a westerner doesn't take a bite of their Peking duck, there is something wrong. But many people in Europe and America choose not to eat meat or fish -- they are known as vegetarians. In the US alone there are 12 million vegetarians and 19,000 more people stop eating meat every week. People often become vegetarians in order to lose weight or eat more healthily. A lot of research has shown that vegetarian diets are healthier than the average western diet. Fried chicken may be delicious to eat, but all that extra fat can damage your heart. There are many other reasons for "turning veggie". It could be that you cannot afford to buy meat. Or maybe you just don't like the taste of it. A large number of vegetarians choose to give up meat because they believe it is cruel to kill animals for food. They believe many animals are not allowed to live in comfort and, when they are killed, it is carried out in a very painful way. While some vegetarians are happy not to eat animals, others take it one step further and refuse to eat any animal product. They are known as vegans and will not eat cheese, yoghurt and eggs, or drink milk. Neither will they wear clothes or shoes made from animal skin, such as leather. They say that if it is wrong to kill an animal for food, it is worse to kill it for clothing. But there are some groups that go even further. Fruitarians believe it is wrong to kill any living plant or animal. Besides refusing to eat meat, they will only eat fruit and vegetables that have not been killed when harvested. This means they cannot take an apple from a tree: they must wait until the apple falls to the ground. Only then can it be considered dead. Question: According to the text, "vegetarians" refer to people who _ . - choose not to eat meat or fish - choose to eat meat or fish - choose not to eat protein - choose to vegetables
A: choose not to eat meat or fish