单选题Student: Professor Lance, your lecture on cloning is very interesting! Professor: ______ Are you a student of biology? Student: No. I major in chemistry.

单选题I'm rather anxious ______ her , for I haven't heard from her for a long time.

单选题It"s a day to celebrate, a time to educate, and a way to make a difference. Earth Day was first observed on April 22, 1970. The tradition began in the United States and is now an international focal point for people who are concerned about the environment. Imagine a time before the Clean Air Act, the Clean Water Act, the Endangered Species Act, and even the Environmental Protection Agency. Hot topics of the time were industrial pollution, nuclear accidents, oil dependency, pesticides, and a variety of social issues. However, policymakers were not yet acting on many important environmental problems. Earth Day grew out of grassroots action and institutional support. Student leader Denis Hayes and Wisconsin Senator Gaylord Nelson were two key organizers for the first event. Over 20 million concerned citizens rallied for clean air and water. College students were a major force in the campaign, although participants of all ages were involved. Still, we cannot really credit a handful of individuals for the success of Earth Day. After all, a major message of Earth Day is that every single person has an important role in the environment. The first Earth Day was very successful, inspiring the passage of congressional protection for air, water, and endangered species. Momentum from the demonstration also fueled the formation of the Environmental Protection Agency. Thirty years later, the focus has changed but the urgency remains the same. Due to increasing amounts of scientific evidence that fossil fuels are changing the global climate, the theme for Earth Day 2000 is Clean Energy. The four major goals of Earth Day 2000 are clean cars, clean power, clean air, and clean investments.

单选题The meeting was put off ______ the chairman's illness.

单选题The team ______ of scientists and experts in different lines of work.

单选题Do you find getting up in the morning so difficult that it's painful? This might be called laziness, but Dr. Kleitman has a new explanation. He has proved everyone has a daily energy cycle.During the hours when you labor through your work you may say that you're "hot. "That's true. The time of day when you feel most energetic is when your cycle of body tem-perature is at its peak (顶峰). For some people, the peak comes during the forenoon. For others it comes in the afternoon or evening. No one has discovered why this is so, but it leads to such familiar monologues (自言自语) as: "Get up, John. You'll be late for work again. " The possible explanation to the trouble is that John is at his temperature-an-ener-gy peak in the evening. Much family quarrelling ends when husbands and wives real-ize what these energy cycles mean and which cycle each member of the family has. You can't change your energy cycle, but you can learn to make your life fit it better. Dr. Kleitman believes that habit can help. Maybe you're sleepy in the evening but feel you must stay up late anyway. Counteract (对抗) your cycle to some extent by habitually stay-ing up later than you want. If your energy is low in the morning but you have an important job to do early in the day, rise before your usual hour. This won't change your cycle, but you'll get up steam (振作精神) and work better at your low point.Get off to a slow start which saves your energy. Get up with a leisurely yawn (打哈欠) and stretch. Sit on the edge of the bed a minute before putting your feet on the floor. Avoid the troublesome search for clean clothes by laying them out the night before. When-ever possible, do routine work in the afternoon and save tasks requiring more energy or concentration for your sharper hours.

单选题Problems like this ______ every day in the factory.

单选题They always keep on good ______ with their next-door neighbors for the children's sake. A. friendship B. terms C. relations D. relatives

单选题(Hard) (as) he worked, (but) Mr. Black couldn't keep the shop (properly).

单选题______ at his knowledge, all the students showed their respect to their teacher.

单选题The Art Institute of Chicago is one of the four ______ art museums in America.

单选题He remembered clearly that he ________ the book on her desk yesterday.

单选题(I recommend) that you all (are) diligent (if) you want to pass (the exam).

单选题How and why this language has survived for more than a thousand years, while spoke by very 　　　　　　A　　　　　　　　　　B　　　　　　　　　　　　　　　　　　　　　　　C 　　few, is hard to explain. 　　　　　　　　　D

单选题I was ______ to find his article on such an ______ topic so ______.

单选题Other medical technology groups are working on ______ telemedicine to rural care. A. applying B. supplying C. replying D. implying

单选题______you don't know the rule won't be a sufficient excuse for your failure. A. It is B. That C. Because D. What

单选题Clerk: Central Ballet. ______? Customer: Yes, what"s on tonight? Clerk: Sleeping Beauty.

单选题He told his friends that he was going to Japan ______.