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请以“知与行”为主题发表一个演讲。

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15 . In 1985 a consumer agency concluded that Xylo brand bicycles are safer to ride than are Zenon brand bicycles. The agency based the conclusion on the ratio of the number of rider injuries to the number of riding hours for each brand of bicycle from 1981 through 19Yet for identically designed bicycles manufactured since 1985, the number of rider injuries has been twice as great among riders of Xylos as among riders of Zenons. Therefore, the agencys conclusion would have been different for the period since 19Which of the following is an assumption that, if true, supports the claim that the agencys conclusion would have been different for the period since 1985？

A. For the period since 1985, the number of riding hours for Zenons totaled at least half the number of riding hours for Xylos.
B. Of all the bicycles ridden in the period since 1985, the percentage of Xylos ridden was twice the percentage of Zenons ridden.
C. Prior to 1985, Zenon owners were more likely than Xylo owners to report the injuries they sustained while riding their bicycles.
D. In 1985 the agency had miscalculated the ratio for Xylos, for Zenons, or for both.
E. Soon after the agency had issued its report, consumer demand for Xylos increased more rapidly than did consumer demand for Zenons.

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In Greenland, Ice and Instability
by Andrew C. Revkin, excerpt from The New York Times January 8, 2008
The ancient frozen dome cloaking Greenland is so vast that pilots have crashed into what they thought was a cloud bank spanning the horizon. Flying over it, you can scarcely imagine that it could erode fast enough to dangerously raise sea levels any time soon.
Along the flanks in spring and summer, however, the picture is very different. For an increasing number of warm years, a network of blue lakes and rivulets of melt-water has been spreading ever higher on the icecap.
The melting surface darkens, absorbing up to four times as much energy from the sun as snow, which reflects sunlight. Natural drainpipes called moulins carry water from the surface into the depths, in some places reaching bedrock.
The process slightly, but measurably, lubricates and accelerates the grinding passage of ice towards the sea.
Most important, many glaciologists say, is the break-up of huge semi-submerged clots of ice where some large Greenland glaciers, particularly along the west coast, squeeze through fiords as they meet the warming ocean. As these passages have cleared, this has sharply accelerated the flow of many of these creeping, corrugated and frozen rivers.
Some glaciologists fear that the rise in seas in a warming world could be much greater than the upper estimate of about 60 centimetres this century made by the Intergovernmental Panel on Climate Change last year. (Seas rose less than 30 centimetres last century.)
The panel&39;s assessment did not include factors known to contribute to ice flows but not understood well enough to estimate with confidence. SCIENTIFIC scramble is under way to clarify whether the erosion of the world&39;s most vulnerable ice sheets, in Greenland and west Antarctica, can continue to accelerate. The effort involves field and satellite analyses and sifting for clues from past warm periods.
Things are definitely far more serious than anyone would have thought five years ago.

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Unlike other forms of narrative art, a play, to be successful , must give pleasure to its

A. plays written for Restoration audiences do not appeal to modern audiences.
B. plays are superior to novels as a form. of narrative art.
C. Restoration audiences were representative of the whole population of their time.
D. playgoers and novel readers are typically distinct and exclusive groups.
E. Restoration drama achieved popular success at the expense of critical success.

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21 . The program to control the entry of illegal drugs into the country was a failure in 19If the program had been successful, the wholesale price of most illegal drugs would not have dropped substantially in 19The argument in the passage depends on which of the following assumptions？

A. The supply of illegal drugs dropped substantially in 1987.
B. The price paid for most illegal drugs by the average consumer did not drop substantially in 1987.
C. Domestic production of illegal drugs increased at a higher rate than did the entry of such drugs into the country.
D. The wholesale price of a few illegal drugs increased substantially in 1987.
E. A drop in demand for most illegal drugs in 1987 was not the sole cause of the drop in their wholesale price.

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