Approximately two thousand one hundred patients received heart implantation in America last year.

A . 5% B . 10% C . 15% D . 不可以这样表述，金额不能增减

A .  Compilation fails. B .  Pi is approximately 3. C .  Pi is approximately 3.141593. D .  An exception is thrown at runtime.

A . 广告商对广告主的广告曝光每百人所收取的费用 B . 广告商对广告主的广告曝光每千人所收取的费用 C . 广告商对广告主的广告曝光每万人所收取的费用 D . 广告商对广告主的广告曝光每千万人所收取的费用

A . savings banks B . saving bank C . saving banks D . savings bank

A . enter a traffic separation zone B . cross a submerged pipeline C . depart a regulated area D . depart a restricted area

A . the same indicated horsepower as a four-stroke/cycle engine B . twice the indicated horsepower as a four-stroke/cycle engine C . one half indicated horsepower as a four-stroke/cycle engine D . one power stroke for every two crankshaft revolutio

A . being B . were C . are D . i

A .  An exception is thrown at runtime. B .  Pi is approximately 3. C .  Pi is approximately 3.141593. D .  Compilation fails.

A . 4 minutes B . 8 minutes C . 12 minutes D . 16 minute

A . are B . were C . being D . i

A . The two points are in low latitudes in the same hemisphere B . The two points are in high latitudes in the same hemisphere C . The two points are near the equator, but in different hemispheres D . One point is near the equator, one point is in a high latitude, and both are near the 180th meridia

During the past 200 years the world population has increased 6 times, the annual world output has increased 80 times, and the distance a person can travel has gone up 1,000 times. There has also been much recent progress in art, culture, learning, and science. Such changes have led to a high rate of production and growth of the economy. Economists fear that within the next 100 to 150 years, the earth's resources will become very scarce. Their fears are partly justified, but we should not be afraid. Industrial civilization adapts to new knowledge. By advancing knowledge, we not only create new forms of resources, but we also find ways to economize their use. Advanced modern knowledge can feed the hungry people of the world and improve their standard of living. The figures in the second paragraph are used for the following purposes EXCEPT______. A．prediction. B．contrast. C．definition. D．explanation.

The puzzle had to do with waves. Though it might seem intuitive that waves carry water to shore, and sand along with it, it's not that simple. The crest(浪尖)of a passing wave lifts a given hit of water upward and landward, but the ensuing trough(波谷) pushes the water back down and Out to sea. Near the bottom, there the sand is, the water was always assumed to just slide back and forth—and the sand with it. "If you take a very aloof look at a beach," says Inman, "you'll realize that if the two motions move sand back and forth the same amount, then all the sand should end up in deep water.' So for beaches to exist, the crest's onshore flow must somehow move enough sand up the beach to counter the seaward tug of both the trough and gravity . The pressure changes in the sand bed, Inman and Conley think, are the key to beach creation. They found that sand doesn't just slide back and forth with each passing wave. Under a trough, it does slide seaward, in a thin layer just above the bottom. But under a crest its movement is often more elaborate. The higher pressure under a crest—higher because the water is piled higher—forces water into the porous(多孔的) sand. This creates strong whirlpools just above the sand, which help loosen it. As the crest passes overhead, the sand first rushes across the bottom; then it abruptly turns violent lifting off the bottom in large, boiling bunches. Finally, just after the crest passes, the sand explodes up into the great water column. The boiling and rushing move more sand than the backsliding under a trough, so there's a net movement of sand toward the shore. What is the primary purpose of this passage？ A．To explain why sand piles up on the beaches. B．To explain why men only prostrate in the sea. C．To propose a new explanation of a phenomenon. D．To refute a misconception.

A.The two points are in low latitudes in the same hemisphere B.The two points are in high latitudes in the same hemisphere C.The two points are near the equator，but in different hemispheres D.One point is near the equator，one point is in a high latitude，and both are near the 180th meridian

A.enter a traffic separation zone B.cross a submerged pipeline C.depart a regulated area D.depart a restricted area

W: At least. It used to be my most favorite song before ! had to hear it so often. Q: What did the two speakers say about Mike's album？ (18) A．It's their most favorite album. B．Both of them are already fed up with it. C．They're glad he has sung it thousands of times. D．They could listen to it another thousands of times.

是 否

A．45 B．35 C．25 D．15

A.The B.In the C.It wast he D.It was in the