单选题They waited in the ______ for the front door to open.

单选题______the difficulties associated with the project, we'll go on with it.

单选题Research on animal intelligence always makes us wonder just how smart humans are. Consider the fruit-fly experiments described by Carl Zimmer in the Science Times. Fruit flies who were taught to be smarter than the average fruit fly 26 to live shorter lives. This suggests that dimmer bulbs burn longer, that there is a(n) 27 in not being too bright. Intelligence, it turns out, is a high-priced 28 . It takes more upkeep, burns more fuel and is slow off the starting line because it depends on learning—a(n) 29 process—instead of instinct. Plenty of other species are able to learn, and one of the things they've apparently learned is when to stop. Is there an adaptive value to limited intelligence? That's the question behind this new research. Instead of casting a wistful glance 30 at all the species we've left in the dust I.Q.-wise, it implicitly asks what the real costs of our own intelligence might be. This is on the 31 of every animal we've ever met. Research on animal intelligence also makes us wonder what experiments animals would 32 on humans if they had the chance. Every cat with an owner, for instance, is running a small-scale study in operant conditioning. We believe that if animals ran the labs, they would test us to 33 the limits of our patience, our faithfulness, our memory for locations. They would try to decide what intelligence in humans is really for, not 34 how much of it there is. Above all, they would hope to study a 35 question: Are humans actually aware of the world they live in? So far the results are inconclusive. A. mind E. advantage I. aptly M. tended B. fundamental F. happened J. overcome N. inclination C. gradual G. spontaneous K. option O. perform D. determine H. backward L. merely

单选题Women have significant advantages over men in space because they need less food and less oxygen and they ______ radiation better.

单选题A frequently Ucited/U example of the endangered species is the panda.

单选题The Quality Control staff is responsible ______ the quality of the products that come out of the factory.

单选题Over the traditional festival people visit each other and______greetings.

单选题选出下列选项中读音不同的选项（  ）

单选题 There was a time, not that long ago, when women were considered smart if they played dumb to get a man, and women who went to college were more interested in getting a 'Mrs. degree' than a bachelor's. Even today, it's not unusual for a woman to get whispered and unrequested counsel from her grandmother that an advanced degree could hurt her in the marriage market. 'There were so many misperceptions out there about education and marriage' that I decided to sort out the facts,' said economist Betsey Stevenson, an assistant professor at the Wharton School at the University of Pennsylvania. So along with Wharton colleague Adam Isen, Stevenson calculated national marriage data from 1950 to 2008 and found that the marriage penalty women once paid for being well educated has largely disappeared. 'In other words, the difference in marriage rates between those with college degrees and those without is very small,' said Stephanie Coontz, a family historian at Evergreen State College. The new analysis also found that while high-school dropouts (辍学学生) had the highest marriage rates in the 1950s, today college-educated women are much more likely to marry than those who don't finish high school. Of course, expectations have changed dramatically in the last half century. 'In the 1950s, a lot of women thought they needed to marry right away,' Coontz said. 'Real wages were rising so quickly that men in their 20s could afford to marry early. But they didn't want a woman who was their equal. Men needed and wanted someone who knew less.' In fact, she said, research published in 1946 documented that 40 percent of college women admitted to playing dumb on dates. 'These days, few women feel the need to play down their intelligence or achievements,' Coontz said. The new research has more good news for college grads. Stevenson said' the data indicate that modern college-educated women are more likely to be married before age 40, are less likely to divorce, and are more likely to describe their marriages as 'happy'. The marriages of well-educated women tend to be more stable because the brides are usually older as well as wiser, Stevenson said.

单选题No one could come up with an easy solution to the government's predicament—labor ______ which is caused by the wars. [A] decline [B] vacancy [C] rarity [D] shortage

单选题The scheme for rebuilding the city center ______ owing to the refusal of a Council to sanction the expenditure of the money it would have required.

单选题We must ______ the assumption that what we have done would have no lasting effect on the global environment. A. reject B. discard C. refuse D. throw

单选题Mary likes classical music ______ her brother likes pop music.

单选题I've (got) five brothers; each of (them) is quite different (from) (the others)

单选题Where do cars get their energy from? For most cars，the answer is petrol.21___________some cars use electricity.These cars have 22 ____请作答此空______motors that get their power from large batteries.In 23

单选题I remember meeting him one evening with his pushcart. I had managed to sell all my papers and was coming home in the snow. It was that strange hour in downtown New York when the workers were pouring homeward in the twilight. I marched among thousands of tired men and women whom the factory whistles had unyoked. They flowed in rivers through the clothing factory districts, then down along the avenues to the East Side. I met my father near Cooper Union. I recognized him, a hunched, frozen figure in an old overcoat standing by a banana cart. He looked so lonely; the tears came to my eyes. Then he saw me, and his face lit with his sad, beautiful smile—Charlie Chaplin"s smile. "Arch, it"s Mickey," he said. "So you have sold your papers! Come and eat a banana." He offered me one. I refused it. I felt it crucial that my father sell his bananas, not give them away. He thought I was shy, and coaxed and joked with me, and made me eat the banana. It smelled of wet straw and snow. "You haven"t sold many bananas today, pop," I said anxiously. He shrugged his shoulders. "What can I do? No one seems to want them." It was true. The work crowds pushed home morosely over the pavements. The rusty sky darkened over New York building, the tall street lamps were lit, innumerable trucks, street cars and elevated trains clattered by. Nobody and nothing in the great city stopped for my father"s bananas. "I ought to yell," said my father dolefully. "I ought to make a big noise like other peddlers, but it makes my throat sore. Anyway, I"m ashamed of yelling, it makes me feel like a fool." I had eaten one of his bananas. My sick conscience told me that I ought to pay for it somehow. I must remain here and help my father. "I"ll yell for you, pop," I volunteered. "Arch, no," he said, "go home; you have worked enough today. Just tell momma I"ll be late." But I yelled and yelled. My father, standing by, spoke occasional words of praise, and said I was a wonderful yeller, Nobody else paid attention. The workers drifted past us wearily, endlessly; a defeated army wrapped in dreams of home. Elevated trains crashed; the Cooper Union clock burned above us; the sky grew black, the wind poured, the slush burned through our shoes. There were thousands of strange, silent figures pouring over the sidewalks in snow. None of them stopped to buy bananas. I yelled and yelled, nobody listened. My father tried to stop me at last. "Nu," he said smiling to console me, "that was wonderful yelling, Mickey. But it"s plain we are unlucky today! Let"s go home." I was frantic, and almost in tears. I insisted on keeping up my desperate yells. But at last my father persuaded me to leave with him.

单选题Without the instrument, we ______ .