单选题His government insisted that he ______ until he finished his degree.

单选题(Alcoholics) have a death rate nearly three times more than (the general population); they are (seven times) more likely than non-alcoholics to (suffer) fatal accidents.

单选题A man______escaped death when a fire broke out in his home on Sunday morning.

单选题What the government should do urgently is to take actions to ______ the economy.

单选题It is a very important game, and it is advisable to ______ seats well in advance.

单选题There are many stereotypes about the character of people in various parts of the United States. In the Northeast and Midwest, people are said to be closed and private. In the South and West, however, they are often thought of as being more open and hospitable. Ask someone from St. Louis where the nearest sandwich shop is, and he or she will politely give you directions. A New Yorker might eye you at first and after deciding it is safe to talk to you, might give you a rather unexpected explanation. A person from Georgia might be very kind about directing you and even suggest some different places to eat. A Texan just might take you to the place and treat you to lunch. American stereotypes are abundant. New Englanders are often thought of as being friendly and helpful. Southerners are known for their hospitality and warmth. People from the western part of the United States are often considered very outgoing. These differences in character can be traced to different factors such as climate, living conditions, and historical development. When travelling from place to place, Americans themselves are often surprised at the differing degrees of friendliness in the United States.

单选题The purpose of Earth Day is ______.

单选题The library needs ______, but it'll have to wait until Sunday.

单选题Is this the house________ Shakespeare was born?

单选题Individuals may at various points in their lives experience discrimination in the allocation of re sources either ______ of being too old or too young.

单选题Mr. Johnson evidently regarded this as a great joke.

单选题______ I saw him ! knew what he had said was correct.

单选题Which of the following is NOT mentioned as a possible cause of lung diseases?

单选题Every chemical change either results from energy being used to produce the change, or causes energy to be ______ in some form.

单选题The hum of conversation ______ as the chairman mounted the rostrum. A. died out B. died off C. died of D. died away

单选题The authority urged the rebellious party to ______ their arms and come back to the negotiating table.

单选题 New research has found that those who work 11-hour days or more increase their chance of a heart attack by two thirds. If you're about to embark on your usual 12-hour day at the office, you might want to pause a while—a few hours, actually. A study has found that those who spend more than 11 hours at work increase their chance of having a heart attack by two thirds. The team from University College London looked at more than 7,000 civil servants working in Whitehall over a period of 11 years and established how many hours they worked on average a day. They also collected information including the condition of their heart from medical records and health checks. Over the period, a total of 192 had suffered a heart attack. Then the study was published in the journal Annals of Internal Medicine, reporting that those who worked more than 11 hours a day were 67 percent more likely to have one than those who had a 'nine to five' job. Professor Mika Kivimki, who led the study, said: 'We have shown that working long days is associated with a remarkable increase in risk of heart disease. Considering that including a measurement of working hours in a GP interview is so simple and useful, our research presents a strong case that it should become standard practice. This new information should help improve decisions regarding medication for heart disease.' 'It could also be a wake-up call for people who over-work themselves, especially if they already have other risk factors,' Professor Kivimki added. Around 2.6 million Britons have heart disease, where the organ's blood supply is blocked by the build-up of fatty deposits in the coronary arteries (冠状动脉). It is the nation's biggest killer, claiming 101,000 lives in this country every year. Heart attacks occur when a coronary artery becomes completely blocked; if the blood supply is not restored, the section of the heart being supplied by the artery will die.

单选题It was all agreed that the first problem the new government would have to ______ was unemployment.

单选题The author states that birds left the tropics because ______.