单选题Earth is believed to ______ by an object the size of Mars at some point in the distant past before its surface cooled.

单选题In the third sentence of Paragraph 2, the "four quarters" refers to ______.

单选题People from different cultures sometimes do things that make each other uncomfortable, sometimes without realizing it. Most Americans【C1】______out of the country and have very【C2】______experience with foreigners. But they are usually spontaneous(朴实的), friendly and open, and enjoy【C3】______new people, having guests and bringing people together formally or informally. They tend to use first names【C4】______most situations and speak freely【C5】______themselves. So if your American hosts do something that【C6】______you uncomfortable, try to let them know【C7】______you feel. Most people will【C8】______your honesty and try not to make you uncomfortable again. And you' 11【C9】______something about another culture! Many travelers find【C10】______easier to meet people in the U. S.【C11】______in other countries. They may just come【C12】______and introduce themselves or even invite you over【C13】______they really know you. Sometimes Americans are said to be【C14】______Perhaps it seems so, but they are probably just【C15】______a good time. Just like anywhere else, it【C16】______time to become real friends【C17】______people in the U. S. If and【C18】______you stay with American friends, they will probably【C19】______introducing you to their friends and family, and if they seem proud【C20】______you, it' s probably because they are. Relax and enjoy it!

单选题The shop owner came up to see ______. A. what was happened B. what was going on C. what the matter was D. what is the matter

单选题If you find yourself repeatedly reading over the same paragraph and ______ it in, that's a sign you've reached the top for the day and should stop. A. not take B. not to take C. did not take D. not taking

单选题In 1991, while the economics of industrialized countries met an economic______, the economies of developing countries were growing very fast.

单选题Phosphorus is used in paints for highway signs and marks because it is {{U}}bright{{/U}} at night.

单选题{{B}}Directions:{{/B}}Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C, and D on ANSWER SHEET 1. A study of art history might be a good way to learn more about a culture than that is possible to learn in general history classes. Most{{U}} (1) {{/U}}history courses concentrate on politics, economics, and war.{{U}} (2) {{/U}}, art history{{U}} (3) {{/U}}on much more than this because art reflects not only the political values of a people, but also religious{{U}} (4) {{/U}}, emotions, and psychology.{{U}} (5) {{/U}}, information about the daily activities of our own can be provided by art. In short, art expresses the{{U}} (6) {{/U}}qualities of a time and a place, and a study of it clearly offers us a deeper understanding than what can be found in most history books. In history books, objective information about the political life of a country is{{U}} (7) {{/U}}; that is, facts about political are given, but{{U}} (8) {{/U}}are not expressed. Art, on the other hand, is{{U}} (9) {{/U}}: it reflects emotions and impressions. The great Spanish painter Francisco Goya severely criticized the Spanish government for its{{U}} (10) {{/U}}of power over people. Over a hundred years later, symbolic{{U}} (11) {{/U}}were used in Pablo Picasso's Guemica to express the{{U}} (12) {{/U}}of war.{{U}} (13) {{/U}}, on another continent, the powerful paintings of Diego Rivera depicted these Mexican artists' concealed{{U}} 14 {{/U}}and sadness about social problems. In the same way, art can{{U}} (15) {{/U}}a culture's religious beliefs. For hundreds of years in Europe, religious art was{{U}} (16) {{/U}}the only type of art that existed. Churches and other religious buildings were filled with paintings that depicted people and stories from the Bible.{{U}} (17) {{/U}}most people couldn't read, they could still understand biblical stories in the pictures on church walls.{{U}} (18) {{/U}}, one of the main characteristics of art in the Middle East was (and still is) its{{U}} (19) {{/U}}of human and animal images. This reflects the Islamic belief that statues are{{U}} (20) {{/U}}.

单选题Every ______ been tried. A. means has B. means have C. mean has D. mean have

单选题Although the police are given considerable authority by society to enforce its laws, they get a relatively low salary as compared with that of other occupational groups which have much fewer authority. A. B. C. D.

单选题Ican’thearwhattheteachersays.Couldyoutalkalittlemore __________ ?

单选题A ______ talk is too long for those children. A. two hours B. two hour's C. two-hour D. two-hours

单选题 A. c{{U}}or{{/U}}n B. sp{{U}}or{{/U}}t C. h{{U}}or{{/U}}se D. w{{U}}or{{/U}}se

单选题Each man and woman must sign ______ full names before entering the examination room. A. his B. her C. their D. one's

单选题--What do you think of the TV play? --Wonderful. It is worth ______ a second time. A. watching B. watched C. seen D. seeing

单选题Ethiopians appear to have evolved a unique way of coping with thin mountain air. But how they do it remains a mystery. One way for the body to get enough oxygen to its tissues when breathing oxygen-poor air is for it to make more red blood cells. This increases the amount of hemoglobin(血红蛋白), the protein that carries oxygen. Although less haemoglobin in the arteries is saturated with oxygen at high altitudes, having more of it makes up for the shortfall. People native to the high Andes are known to have more red blood cells than lowlanders, and athletes who train at altitude can increase their concentration of cells. But while many Tibetans also live at high altitudes, they do not have significantly elevated levels of haemoglobin. Instead they seem to boost the amount of nitric oxide, which dilates(使膨胀) blood vessels and increases blood flow. Now Cynthia Beall, an anthropologist from Case Western Reserve University in Cleveland, Ohio, has found a third kind of adaptation. When she tested the blood of 236 people in the Ambaras region in the Semien Mountains of Ethiopia, she found that 95 percent of the haemoglobin in their arteries is saturated with oxygen, almost as much as that of people living at low altitudes and roughly 5 per cent above that of residents in the Andes or Tibet. "That shouldn't be, "says Beall. They must have a massively efficient way to get oxygen from the lungs to the blood, she says. But just what remains mysterious. They do not have higher concentrations of haemoglobin than anyone else, nor do they have a different kind of haemoglobin. Beall adds that this ability might be found in all people living in that part of the world, and not just those in the study. It might be why so many world-class endurance athletes are Ethiopian. "The next study needs to look at that,"she says.