单选题In the early 20th century Americans believed science and technology could ______.

单选题Three fundamental aspects of (forest conversation) are the protection of immature trees, the use (of proper) harvesting methods, and (provide) for an environment (that supports) reproduction.

单选题(Witnesses) of the crime (find difficult) to explain (why) they (didn't) call the police.

单选题(Electronic) mail to describe an upcoming workshop (should use) only (if) potential participants use this form of communication (regularly).

单选题Is this an ______ order or a personal request?

单选题A: Pamela, can you come to a meeting on Friday? B: ______Let me check my schedule. When are you having it?

单选题A: Would you like to leave a message? B: ______.

单选题The pianist was{{U}} adept{{/U}} at playing the arpeggios.

单选题In the past few decades, remarkable findings have been made in ethnology, the study of animal social behavior. Earlier scientists had (61) that nonhuman social life was almost totally instinctive or fixed by genetics. Much more careful observation has shown that (62) variation occurs among the social ties of most species, showing that learning is a part of social life. That is, the (63) are not solely fixed by the genes. (64) , the learning that occurs is often at an early age in a process that is called imprinting. Imprinting is clearly (65) instinctive, but it is not quite like the learning of humans; it is something in between the two. An illustration best (66) the nature of imprinting. Once, biologists thought that ducklings followed the mother duck because of instincts. Now we know that, shortly (67) they hatch, ducklings fix (68) any object about the size of a duck and will henceforth follow it. So ducklings may follow a basketball or a briefcase if these are (69) for the mother duck at the time when imprinting occurs. Thus, social ties can be considerably (70) , even ones that have a considerable base (71) by genetics. Even among the social insects something like imprinting (72) influence social behavior. For example, biologists once thought bees communicated with others purely (73) instinct. But, in examining a "dance" that bees do to indicate the distance and direction of a pollen source, observers found that bees raised in isolation could not communicate effectively. At a higher level, the genetic base seems to be much more for an all-purpose learning rather than the more specific responses of imprinting. Chimpanzees, for instance, generally (74) very good mother but Jane Good all reports that some chimps carry the infant upside down or (75) fail to nurture the young.

单选题The government is trying to help these enterprises out of the______by various means.

单选题These explorers received Uliberal/U rewards for the risks they had taken and felt proud.

单选题On (each) side of the highway (was) hundreds of billboards (advertising) everything from modern motels to roadside stands that sell (fresh fruit) and bedspreads.A. eachB. wasC. advertisingD. fresh fruit

单选题The student"s aggressive personality kept him from having many friends.

单选题It was ______ that the boy was able to solve the problem so quickly.

单选题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: Hey, I heard you bought a parrot. Woman: That's right. Now if I could only get it to talk. Question: What does the woman want to do?

单选题A severe flood struck the city and there was a ______ shortage of food.

单选题A: How about seeing a movie with me today, Alan?B: ______

单选题A: ______ .B: I'm having a rough time communicating with other students now that I don't speak the native language well.