When a person travels over long distances, the place may not be the only change. When his or her body rhythms get thrown off, he or she suffers from jet lag -- it's hard to sleep and eat at the right times in the new location. Humans and animals have a biological clock in their body that tells them when to sleep, and when to wake. When someone comes to a different place far away, this biological clock takes a while to match the day and night time of the new place. In a new study, reported in November's Science News, researchers at the University of California, Berkeley tested the effects of jet lag on hamsters . They wanted to know how serious jet lag would affect the brain and thinking habits of the animals. They think what happens to hamsters may happen to humans, too. In their experiments, the researchers first moved the hamsters' schedules forward by six hours. The animals' eating schedules, for example, were changed. If a hamster was often fed at noon and 4 pm, then it ate at 6 pm and 10 pm on the new schedule. People who travel from China to Europe experience the same shift, since the two regions are about six hours apart, half the shift between China and the USA. After three days, the scientists did it again - they shifted the hamsters' schedules forward by another six hours. Three days after that, they did it again; and then again three days later. For a full month, the scientists changed the hamsters' routines every three days. During the study, the hamsters slept the same amount every day as they did before the study. However, their sleep patterns had a hard time keeping up with the changing schedule. What's more, they seemed to feel low. The researchers also found that the hamsters had trouble with basic learning exercises during the study. The animals' thinking problems didn't go away when the experiment was over. A month after they went back living on a normal schedule, the hamsters still had trouble with basic mental tasks, such as learning and memory. The scientists concluded that serious... We can infer from the text that _ . A) The experiments were carried out on a jet plane B) It is unclear how to avoid jet lag's side effects now C) Side effects of jet lag will remain in one's whole life D) Only humans and hamsters have a biological clock
B
The United States of America is the most culturally diverse country in the world in terms of culture religion, ethnicity and sexual orientation. As a combination of various races and cultures, America is home to all. The culture here is so unique that citizens can be just as proud of their original cultural heritage as they are to be American. What is now the US was initially inhabited by native people until the land was settled by various European groups and African slaves. Since the 20th century, the country has become a heaven for people from all over the globe . The arrival of immigrants has shifted populations from rural areas into cities because immigrants tend to settle in urban areas. At present, 81 percent of the inhabitants in the US live in cities. Cultural and ethnic diversity adds a unique flavor to cities that is expressed through distinct neighborhoods, restaurants, places of worship, museums, nightlife and multicultural learning environments. Unique musical forms, such as jazz, rock and roll, Chicano music, and the blues, grow in the US by mixing a variety of culturally distinct musical traditions to create a new form. At the executive level, the country is headed by a mixedrace president; two posts on the Supreme Court are held by members of the country's two largest minorities.There is also diversity in state and local governments. Without its rich mixture of races and cultures, America would not be the nation that it is today. Founded upon the basis of equality and freedom, America acts as a stage where different cultures not only coexist peacefully, but develop well. We would most probably read this passage in a book about _ . A) science B) history C) culture D) amusement
C
Q: Regarded as one of the English language's most gifted poets, John Keats wrote poetry that concentrated on imagery, human nature, and philosophy. Although Keats didn't receive much formal literary education, his own studies and passion brought him much success. Additionally, his own life situation influenced his poetry greatly. Growing up as a young boy in London in a lower middle-class family, the young John didn't attend a private school, but went to a public one. His teachers and his family's friends regarded him as an optimistic boy who favored playing and fighting much more than minding his studies. After his father's death in the early 1800s, followed by his mother's passing due to tuberculosis , he began viewing life differently. He wanted to escape the world and did so by reading anything he could get his hands on. At around the age of 16, the teenage John Keats began studying under a surgeon so that he too might become a doctor. However, his literary appetite had taken too much of his fancy, especially with his addiction to the poetry of Ehmund Spenser. He was able to have his first full poem published in the Examiner in 1816, entitled O Solitude! If I Must With Thee Dwell. Within two months in 1817, Keats had written an entire volume of poetry, but was sharply criticized by a magazine. However, the negative response didn't stop his pursuit of rhythm . John Keats' next work was Endymion, which was published in May 1818. The story involves a shepherd who falls in love with the moon goddess and leads him on an adventure of one boy's hope to overcome the limitations of being human. Following Engymion, however, he tried something more narrative-based and wrote Isabella. During this time, John Keats began seeing his limitations in poetry due to his own limit in life experiences. He would have to have the "knowledge" associated with his poems. His next work was Hyperion that would attempt to combine all that he learned. However, a bout with tuberculosis while visiting Italy would keep him from his work... What can we infer from the passage? A) Keats' family must have been very poor when he was young. B) Edmund Spenser was the greatest poet in Keats' time. C) It is likely that Keats rewrote his poem Isabella. D) The poem Hyperion wasn't completed by Keats.
A: D
Many people are concerned about the state of the earth in terms of its energy supplies and changing climate.The clear message broadcast by all responsible governments is that every person has a part to play.Here are some detailed instructions. 1.Prevent pollution by disposing of all your litter and waste in the correct,legal way,such as using onstreet waste receptacles when you are out and about,or putting it in your domestic rubbish can when you're at home.Follow local procedures for normal waste disposal.Contact your local authority for advice on disposing of unusual waste items,such as paint and computer parts. 2.Recycle all materials that can be processed by your local authority.Place plastics,metals,paper and glass in the correct collection receptacles.Donate unwanted items to the charities that are happy to accept good condition clothing,furniture and even automobiles. 3.Look after reserves of water by making sure you turn off the tap after use and by repairing leaks and drips.Purchase waterefficient appliances.Take showers instead of baths.Gather rainwater for garden use and use your lawn sprinkler less often or not at all. 4.Save energy by choosing Energy Star products.Turn these off,as well as lights,when you don't need them to be on.Use air condition and heating less often.Make sure your home is insulated correctly to maintain a steady temperature. 5.Reduce the amount of the material you use.Print emails occasionally or not at all rather than printing them every time.You buy new things when you actually need them rather than on a whim .Organize a car pool with friends to use fuel efficiently. In a word,we should try to use the world's resources efficiently to protect the environment. Why should you take showers instead of baths? A) Because it is comfortable. B) Because it can save lots water. C) Because it can gather water. D) Because it is convenient to use.
B