单选题During the experiment, the subjects were asked______.

单选题The reason (why) I love (watching) Tony (surf) is (because) he is so graceful and beautiful when he surfs.

单选题Woman: Are you sure you cleaned your car thoroughly? You want to impress the boss. Man: I'd better double check to be sure. Question: What will the man probably do next?

单选题(So great) (was) the influence of Thomas Paine (on) his own time that John Adams suggested that the era (was called) "The Age of Paine".

单选题{{B}}Passage Five{{/B}} Most parents prize the diversity within their children's public schools. They know that learning to cooperate and excel in a diverse, real-world setting is a key to success in the 2lst-century workplace and marketplace. But how "diverse" and "real-world" is a school that does not have any minority teachers? The bad news today is that some 40 percent of America's public schools have no teachers of color. The good news is that we have an opportunity to recruit and encourage more Americans of color to enter the teaching profession. And our success in doing so can have a powerfully positive impact on student achievement. Obviously, a teacher's effectiveness depends, first and foremost, on his or her skills and high expectations, not on the teacher's color. Yet we also know that children of color--40 percent of the student population and rising- benefit in important ways by having some teachers who look like them, who share similar cultural experiences, and who serve as role models demonstrating that education and achievement are things to be respected. Bear in mind that teachers do not teach only facts and "content". They also model appropriate behaviors and teach by personal example. And for many children, the teachers and other adults in their school are the most important authority figures outside of their home. So it is important to expose children to a diverse teaching staff--and to diverse role models- within each of our schools. Where we have an urban school with an all-minority staff or a suburban school with an all-white staff, we are giving students a stunted educational experience. Issues of diversity are especially relevant today, as public schools are redoubling their commitment to raising standards and closing achievement gaps. We need to seize every opportunity to boost the achievement of poor and minority students. I believe- and an impressive body of research confirms--that recruiting and retaining more minority teachers can be crucial to our success. NEA has made it a core strategic priority to increase the recruitment and retention of teachers of diverse backgrounds. Beyond NEA's own programs, we are joining with other organizations to create the National Collaborative on Diversity in the Teacher Workforce. But we can't do it alone. States and school districts need to develop programs to assist teacher's aides--large numbers of whom are minorities--to advance their education and become fully licensed teachers. Other programs can reach out to minorities still in school, offering encouragement and incentives to enter the teaching profession. At the same time, states must ensure that relevant tests do not bar promising minority candidates from entering the profession.

单选题Man: Can you come over for dinner tonight? Woman: I'm up to my ears in work, so I'll have to take a rain check. Question: What does the woman mean?

单选题Jack was completely ______ by the criminal"s disguise.

单选题Which of the following is the best title for the text?

单选题A: Has everyone submitted their proposals to me? B: ______.

单选题Man: Hey, Mary. I was invited to be a judge for the Miss America Beauty Contest. Woman: Oh, really? Come on, you're pulling my leg. Question: what does the woman mean?

单选题Most lecturers find it expedient to use notes when addressing to graduate students.

单选题The landscape can change abruptly after a rainstorm in the desert in Xinjiang.

单选题If a child starts to speak later than others, he will ______.

单选题This rule cannot be ______ to every case.

单选题Man: Our budget is a little tight this year. As we plan our vacation, let's keep that in mind. Woman: There are a lot of very interesting things to see that are close to home. Maybe we could consider some things like backpacking in the mountains.Question: Why does the woman suggest a backpacking in the mountains?

单选题A: Have you heard that all flights have been cancelled because of the weather? B: ______.

单选题Because of adverse weather conditions, the travelers stopped to camp.

单选题To get from Kathmandu to the tiny village in Nepal, Dave Irvine-Haltiday spent more than two days. When he arrived, he found villagers working and reading around battery powered lamps equipped with light-emitting diodes, or LEDs—the same lamps he had left there in 2000. Irvine-Halliday, an American photonics engineer, was not surprised. He chose to use LED bulbs because they are rugged, portable, long-lived, and extremely efficient. Each of his lamps produces a useful amount of illumination from just one watt of power. Villagers use them about four hours each night, then top off the battery by pedaling a generator for half an hour. The cool, steady beam is a huge improvement over lamps still common in developing countries. In fact, LEDs have big advantages over familiar incandescent (白炽的) lights as well--so much so that Irvine-Halliday expects LEDs will eventually take over from Thomas Edison's old light bulb as the world's main source of artificial illumination. The dawn of LEDs began about 40 years ago, but early LEDs produced red or green glows suitable mainly for displays in digital clocks and calculators. A decade ago, engineers invented a semiconductor crystal made of an aluminum compound that produced a much brighter red light. Around the same time, a Japanese engineer developed the first practical blue LED. This small advance had a huge impact because blue, green, and red LEDs can be combined to create most of the colors of the rainbow, just as that in a color television picture. These days, high-intensity color LEDs are showing up everywhere such as the traffic lights. The reasons for the rapid switchover are simple. Incandescent bulbs have to be replaced annually, but LED traffic lights should last five to ten years. LEDs also use 80 to 90 percent less electricity than the conventional signals they replace. Collectively, the new traffic lights save at least 400 million kilowatt-hours a year in the United States. Much bigger savings await if LEDs can supplant Mr. Edison's bulb at the office and in the living room. Creating a white-light LED that is energy-saving, cheap and appealing has proved a tough engineering challenge. But all the major lightbulb makers—including General Electric, Philips, and Osram-Sylvania--are teaming up with semiconductor manufacturers to make it happen.

单选题The purpose of writing this passage is to .