单选题Helen ______ into the river but that I caught her.

单选题But many in the commission are well aware of such needs, and are ______ to address them.

单选题He had been ______ to give up much of his time to housework.A. orderedB. persuadedC. compelledD. frightened

单选题Questions 24—26 are based on the talk about the euro. You now have 15 seconds to read Questions 24—26.

单选题How will the territorial disputes between China and Japan be settled according to the author?

单选题About myopia—if you have it, be happy. As shown by numerous scientific studies, nearsighted men and women boast a higher average intelligence than their nonmyopic cohorts. The precise mechanism of this association remains unknown, but it is tempting to postulate an effect of myopia on early childhood development. Most nearsighted kids wander around undiagnosed for years, and during this formative period—unable to see the baseballs, Frisbees, and rocks thrown at them by their playmates—they spend a lot of time indoors. The nonathletic myopias who take up reading to while away the hours get high scores on the SATs, while those who take up eating tweak our claustrophobia by overflowing the adjacent seat on airplanes. Myopia also exerts a compelling influence on career choice: the great majority of my fellow ophthalmologists wear either contact lenses or thick myopic spectacles. Pathology breeds preoccupations. However beautiful the human eye, it serves a more important purpose than romantic allure. Forty percent of the brain is devoted to vision, which provides us with more information than our other four senses combined. Our optic nerves transmit millions of impulses to the brain every second, impulses that specify the location, color and intensity of light for all the points in our visual space. Better yet, thanks to a mysterious algorithm that fuses the slightly disparate images from each of our eyes, our visual cortex, via a neurological miracle known as depth perception, shows us the world in three dimensions. An impressive feat since a video camera, arguably the benchmark of modern technology, can muster only two dimensions. Certain ocular tissue stands on the pinnacle of evolution. How does nature, so crude in claw and fang, create a surface that brings light into a pinpoint focus? This surface must be perfectly curved, perfectly transparent, perfectly smooth. It must be—water! Which is to say, the cornea owes its optical perfection to a tear film whose dissolved salts, lipids, and proteins maintain a flawless wetted surface. A man who has no tears stands on the brink of blindness. Worse yet, that man will writhe in agony: a dry cornea, thanks to the most exquisite pain threshold in the human body, responds to each blink with a tormenting jolt. Dry eye victims compare the sensation to that caused by rubbing the eyeball with shards of glass.

单选题The database program searches a certain record for a match in a particular field to whatever data you specify. This is called ______ a database. A．displaying B．sorting C．calculating D．querying

单选题The ______ of lung cancer is particularly high among long-term heavy smokers, especially chain smokers.

单选题None of these high technology methods are of any value if the sites ______ they are applied have never mineralized, and to maximize the chances of discovery, the explorer therefore pay particular attention to ______ the ground formations most likely to mineralize. A. that... selecting B. to which... selecting C. where... select D. which... select

单选题General acceptance of 3-D films may prove hard to come by as the experience of three decades ago indicated. A. obtain B. explain C. understand D. discerm

单选题Is athletic expertise attained or innate? Those who have suffered the tongue-lashing of a cruel games master at school might be forgiven for doubting the idea that anyone and everyone is capable of great sporting achievement, if only they would put enough effort into it. Practice may make perfect, but not all are built in ways that make it worth bothering in the first place. The latest evidence of this truth has been gathered by Sabrina Lee of Simon Fraser University in Vancouver and Stephen Piazza at Pennsylvania State University. They have looked at the physical structure of short-distance runners and found that their feet are built differently from those ofcouch potatoes. Dr. Lee and Dr. Piazza already knew that short-distance runners tend to have a higher proportion of fast-contracting muscle fibres in their legs than more sedentary folk can muster. They suspected, though, that they would find differences in the bone structure as well. And they did. They looked at seven university sprinters who specialize in the 100-metre dash and five 200-metre specialists, and compared them with 12 non-athletic university students of the same height. In particular, they looked at the sizes of bones of the toes and heel. They also used ultrasonic scanning to measure the sliding motion of the Achilles tendons of their volunteers as their feet moved up and down. This allowed them to study the length of the lever created by the tendon as it pulls on the back of the heel to make the foot flex and push off the ground. Dr. Lee and Dr. Piazza found that the toes of their short-distance runners averaged 8.2cm in length, while those of common people averaged 7.3cm. The length of the lever of bone that the Achilles tendon pulls on also differed, being a quarter shorter in short-distance runners. These findings suggest short-distance runners get better contact with the ground by having longer toes. That makes sense, as it creates a firmer platform to push against. In a short-distance running race, acceleration off the block is everything. Cheetahs, the champion of short-distance runners of the animal kingdom, have non-flexible claws that give a similar advantage. It is possible—just—that the differences in physical structure are the result of long and rigorous training. But it is unlikely. Far more probable is that the old saying of coaches, that great short-distance runners are born not made, is true. Everyone else, games masters included, should just get used to the idea.

单选题The mother didn't know who ______ for the broken glass. A. blamed B. be blamed C. to blame D. would blame

单选题As long as we are alive, we are learning and, in fact, some of our most important learning takes place outside of school ______ in school.

单选题IBM is a company of ______

单选题Human facial expressions differ from those of animals in the degree to which they can be______controlled and modified.(2003年中国科学院考博试题)

单选题Most of Americans get so used ______ TV. so dependent on its flickering (闪动的) pictures, that it begins to dominate their lives.

单选题On the large board in the main hall of the airport, you can easily find the different destinations ____ which airlines can take you.A．inB．of C．to D．by