单选题By the time of 1969, there were many space explorations. A. have been B. must be C. had been D. must have been

单选题Helen was so persistent that her husband ______ at last.

单选题Phyllis Wheatley is regarded as America"s first black poet. She was born in Senegal, Africa, about 1753 and brought to America aboard a slave ship at about the age of seven. John and Susannah Wheatley bought her for three pounds at a slave auction in Boston in 1761 to be a personal servant of Mrs. Wheatley. The family had three other slaves, and all were treated with respect . Phyllis was soon accepted as one of the family, which included being raised and educated with the Wheatley"s twin 15-year-old children, Mary and Nathaniel. At that time, most females, even from better families, could not read and write, but Mary was probably one of the best educated young women in Boston. Mary wanted to become a teacher, and in fact, it was Mary who decided to take charge of Phyllis"s education. Phyllis soon displayed her remarkable talents. At the age of twelve she was reading the Greek and Latin classics and passages from the Bible . And eventually , Mrs. Wheatley decided Phyllis should become a Christian. At the age of thirteen Phyllis wrote her first poem. She became a Boston sensation after she wrote a poem on the death of the evangelical preacher George Whitfield in 1770. It became common practice in Boston to have "Mrs. Wheatley"s Phyllis" read poetry in polite society. Mary married in 1771, and Phyllis later moved to the country because of poor health, as a teacher and caretaker to a farmer"s three children. Mary had tried to interest publishers in Phyllis"s poems but once they heard she was a Negro they weren"t interested. Then in 1773 Phyllis went with Nathaniel, who was now a businessman, to London. It was thought that a sea voyage might improve her health. Thirty-nine of her poems were published in London as Poems on, Various Subjects, Religious and Moral . It was the first book published by a black American. In 1775 Phyllis wrote a poem extolling the accomplishments of George Washington and sent it to him. He responded by praising her talents and inviting her to visit his headquarters. After both of her benefactors died in 1777, and Mary died in 1778, Phyllis was freed as a slave. She married in 1778, moved away from Boston, and had three children. But after the unhappy marriage, she moved back to Boston, and died in poverty at the sage of thirty.

单选题Had I run out of gas, I {{U}}ought to have{{/U}} called the garage.

单选题Work is a very important part of life in the United States. When the early Protestant 81 came to this country, they brought the 82 that work was the way to God and heaven. This attitude, the Protestant work 83 , still 84 America today. Work is not only important for 85 benefits, the salary, but also for social and 86 needs, the 87 of doing something for the good of the society. Americans spend most of their lives working, 88 productive. For most Americans, their work 89 them: They are what they do. What happens, 90 , when a person can no longer work? Most Americans stop working at age sixty-five or seventy and retire. 91 work is such an important part of life in this culture, retirement can be very difficult. Retirees often feel that they are useless and 92 . Of course, some people are happy to retire; but leaving one"s job, 93 it is, is a difficult change, 94 for those who look forward to retiring. Many retirees do not know 95 to use their time or they feel lost without their jobs. Retirement can also bring 96 problems. Many people depend on Social Security checks every month. 97 their working years, employees 98 a certain percentage of their salaries to the government. Each employer 99 gives a certain percentage to the government. When people retire, they receive this money as 100 .

单选题I want to talk to the person breaking that cup.

单选题As an English major student at one of the most famous universities in Chin

单选题British scientists have found how to diagnose the disease, which causes loss of memory and personality change.

单选题Approximately how much of the Earth's atmosphere is nitrogen?

单选题Ordinary people are now lacking of the scientific knowledge about nutrition.

单选题The salesman approached the house cautiously when he saw the vicious dog at the door.

单选题Her silence is an indication of his disapproval. A. testimony B. statement C. suggestion D. announcement

单选题Proper lighting is a {{U}}necessary{{/U}} for good eyesight even though human night vision can be temporarily impaired by extreme flashes of light.

单选题Pan of his general thrift is to be meticulous in verifying monthly expenses. A. painstaking B. dilatory C. meretricious D. gaudy

单选题The number of days of vacation provided to university employees remain constant from year to year.

单选题 The first 50 years of the next millennium will be critical for the world's population. By 2050 population growth should have leveled off, but by then we'll have 10 billion people -- two-thirds as many again as we have today. The rate of population growth is something we can choose right now, though it's not something that just happens, but a matter of human choice. The choice is a complicated one, with many variables, but it remains a choice. If we want to prevent a population explosion, we should take action now -- or assist the poorer countries to do so. They need better government, better institutions, better labor and capital markets, better schools. Anything that increases the value of women's time and adds to the cost of caring for a child makes a woman less likely to have that child. Since big families are often seen as safety nets for illness and old age, improving poor people's access to insurance, pensions and welfare institutions also has a major impact. This can be as simple as rural credit, providing a means of saving. Finally, there is education -- both for women and, perhaps even more important, for the next generation of children. These steps are there to be taken, but there appear to be some countries that are not seriously trying at the moment. If we cannot achieve that we will certainly not control population. That said, I don't feel pessimistic that we are going to run out of resources: we are becoming more efficient at producing food faster than the rate at which population is increasing. There is, however, a risk that we will wreck the environment so effectively that the world will no longer be an attractive place to live. That really would be a dismal outcome, to reach world population equilibrium only to find we'd destroyed the natural environment in the process.

单选题I would have finished my paper Uif it was/U at all possible, but I was fully occupied the whole of last week.

单选题This colorless gas is called oxygen, who fires burn much better.

单选题The student asked her professor if he would have gone on the space ship he did know earlier. A. if he knew B. if he knows C. he had known D. had he known

单选题The underlined word "intact" in Paragraph 2 is closest in meaning to ______