单选题Barium is a soft, heavy, silvery white metallic element that readily reacts with another elements to form useful compounds.

单选题Like triglycerides, cholesterol is a type of fat that is both consumed in the diet but manufactured by the body.

单选题A computer is a fast electronic machine------information according to a stored sequence of instructions called a program.

单选题Listening4"StudentsonCampus"

单选题The (large) collection of the Williams College Museum of Art (includes) ancient and medieval art ,but (much) exhibits are (modern)or contemporary.

单选题All the planets in the Solar system except Mercury and Venus have natural satellites, — objects that revolve around the planets.

单选题The membrane surrounding {{/U}}a single-celled animal or plant or any individual cellin a multicellular organism is important in the respiratory and nutritionally {{/U}}processes of that cell.

单选题Summer Break Student A: Hi, Wendy. Student B: Hi, Sven. Student A: Only two more weeks of classes, eight school days actually, then exams start. Student B: Yes, I will be glad when ______. I ______ and very stressed at exam time. I find myself eating constantly and I don"t seem to find any time to exercise. Student A: Exams don"t bother me that much. This year most of the marks for my courses were ______ and research projects. I only have two exams. Student B: You are lucky. I have five. I also need to get good marks, over 80 percent, or I ______ keep my scholarship. Student A: What are you doing for summer break? Student B: I would like to ______ at a restaurant in Florence. My uncle owns a restaurant ______ and he has offered me a job for the summer. In Italy, there are ______, so he would like to have someone ______. It would also be an excellent opportunity for me to practice my Italian. I hope to be a translator one day, so I need to be ______. Student A: That would be a wonderful summer. Student B: Yes, I know. I really want to go. The problem is my father ______ three weeks ago. He is out of the hospital now and not in too much danger, but he ______ the house. My brother is ______, so I am the only one to help my mother around the house. It is such a dilemma. I don"t know what to do. Student A: Yes, I could see that would be a very difficult decision. You are only young once, though, and a chance to go to Florence for the summer, ______. Student B: I am ______ going to Italy, but I just feel so guilty. What about you, Sven? What are your plans for the summer? Student A: Well, I have a dilemma, too. I would love to go to Nepal and ______ that could use me to ______ in engineering skills. It would be a chance to share what I already know and I think it would be really interesting to spend four months in Nepal. However, I don"t find out until next week whether or not I ______ the program. If I do get accepted, I won"t be making any money and I need money to return to university for my final year in September. Student B: If you don"t go to Nepal, where would you work? Student A: I don"t know. I have had some interviews with some construction companies. There are a lot of ______ on the south side of the city. There were three companies that thought they would have a place for me to ______ and the pay is good. None of the three companies are unionized, but they all ______. I would ______ where I could use the engineering skills I have already acquired. I have applied to several companies for inside work, but ______ and neither seemed very promising. It would look much better ______ after I graduate, if I have work experience in my field. Also, many engineering students get hired after they graduate by the company they worked for the previous summer. Student B: I can see your problem. If you get the opportunity to go to Nepal, I would probably go. Can"t you borrow money ______ for your final year? Student A: Probably, but I hate to start off ______. Engineering fees are rising by 10 percent next year. It is not ______. Student B: No, but if you have the opportunity to go to an interesting job in Nepal, and ______, I think that would be wonderful. Student A: You are probably right. I appreciate your advice.

单选题Some subsistence activities such as hunting large animals or netting fish require — to work together.

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单选题Listen to Track 69. A. Very few students are asked to consider writing an honors thesis. B. The woman has shown poor research skills in the past. C. An honors thesis could help the woman get into law school. D. The woman should write a proposal outlining her research skills.

单选题Listentopartofaconversationbetweentwostudents.Nowgetreadytoanswerthequestions.Youmayuseyournotestohelpyouanswer,

单选题.In the late 1970’s and early 1980’s, the United States developed the reusable space shuttle ________to space cheaper and easier.

单选题The word "estimated" in line 11 is closest in meaning to

单选题The population of California (more than) doubled (during the. period 1940-1960, creating problems in road-building and (provide. water for its arid (southern section). A. more than B. during the C. provide D. southern section

单选题Listentopartofalectureinaphilosophyclass.Nowgetreadytoanswerthequestions.Youmayuseyournotestohelpyouanswer,Listenagaintopartofthelecture.Thenanswerthequestion.

单选题Which of the following can be inferred about the findings described in paragraph 2 ?

单选题Many of species of milkweed are among the most dangerous of poisonous plants, while A B C others have little, if any, toxicity. D

单选题Civil Engineering: Suspension Bridge Professor: Good morning, class. Today I ______ a picture of ______ bridge called a suspension bridge. Student: That bridge ______ me. Is it the Clifton Suspension Bridge in Bristol, England? Professor: Yes, you"re right. ______ today. Can anyone tell me who built it and what is ______ the suspension bridge? Student: Well, the Clifton Suspension Bridge was designed in 1830 by a man named Brunel, but he died before the bridge was finished. ______, the bridge was finally completed in 1864. Professor: Excellent. You"re really with it today. Now who can tell me about suspension bridges? Or is this question ______? Student: I think I can answer that. According to some books I"ve read about suspension bridges, ______ from cables that are strung across a river like the Avon Gorge in the picture. What makes a suspension bridge unique is that ______ and the road deck hangs below the supports ______ them like other bridges. Professor: Excellent. Let me ______. Some of the oldest suspension bridges used ropes instead of cables ______. This only allowed for people to hang ______. Soon after, ______ between the ropes. Unfortunately, these bridges were not convenient or safe for taking donkeys or carts across because of the swinging of the ropes and the loads were just too heavy for the bridge to bear. The suspension bridges that we use today, like the one in the picture, were first developed ______ in the early 1800"s. Civil Engineers such as Telford and Brunel thought of the idea of using towers to lift up the cables and using a frame to ______ the bridge called a truss. The towers allowed the bridge to ______, which would give horses and carriages a means to cross. In a nutshell, Brunel designed the first non-moving bridge. Today, the design of the suspension bridge is the same, but we use steel cables ______ found on a bicycle chain. In fact, Brunel"s famous bridge still has the ______. Student: How do suspension bridges hold the heavy weight of cars and trucks? In the past, they only used horses and carriages so the bridges didn"t carry as much weight as they do now. Professor: Good point. All modem bridges that you see today use ______ to hold the roadway. These cables are hung over two towers and held by concrete blocks ______. Vehicles such as cars and trucks ______ and because the roadway is held up by hangers from the steel cables, they can ______ the two towers. This means that the two towers are always compressed, which allows them to ______ or concrete blocks ______ the tension from the steel cables. Steel is the preferred material used in long suspension bridges because it can handle extremely heavy weight. Steel is stronger than iron and is also ______. A famous example can be seen in the Brooklyn Bridge in New York, USA. Student: Are there any problems with a suspension bridge? Professor: I"m glad you asked me that question. There have been ______ suspension bridges. If the engineers design a bridge that is ______, the bridges will not be strong enough. They will begin to move and ______, even in light winds and will eventually ______ or river below.

单选题The word "converted" in line 14 is closest in meaning to