问题
单项选择题
把玻璃管或温度计插入橡皮塞或软木塞时，常常会折断而使人受伤。下列操作方法不正确的是（）。
A、可在玻璃管上沾些肥皂水或甘油等作润滑剂
B、橡皮塞等钻孔时，打出的孔比管径略小，可用圆锉把孔锉一下，适当扩大孔径
C、一手拿着塞子，一手拿着玻璃管，边旋转边慢慢地把玻璃管插入塞子中
D、操作时双手距离较远
答案
参考答案：D
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把玻璃管或温度计插入橡皮塞或软木塞时，常常会折断而使人受伤。下列操作方法不正确的是（）。
A、可在玻璃管上沾些肥皂水或甘油等作润滑剂
B、橡皮塞等钻孔时，打出的孔比管径略小，可用圆锉把孔锉一下，适当扩大孔径
C、一手拿着塞子，一手拿着玻璃管，边旋转边慢慢地把玻璃管插入塞子中
D、操作时双手距离较远
参考答案：D
Passage Three
| In the world of climate change, it is in the Earth’s Cold regions where trends can most easily be seen. The cryosphere, where water is found in solid form, is among the most sensitive regions to temperature change. The sensitivity of ice and snow to temperature changes is an early indicator of even relatively small differences, says University of Colorado at Boulder senior researcher Richard Armp. He has found that today’s receding and thinning sea ice, mountain glacier mass losses, decreasing snow extent, melting permafrost (永久冻土), and rising sea level are all consistent with warming. Global mean temperatures have risen one degree Fahrenheit over the past 100 years, with more than half of the increase occurring in the last 25 years, observes Armp who is affiliated with the National Snow and Ice Data Center headquartered at CU-Boulder. "As slight as that may seem, it’s enough to make a difference," said Armp. "Now, long-term monitoring of a series of cold region, or cryospheric, parameters (参数) shows that for several decades the amounts of snow and ice around the world have been decreasing. " The extent of Arctic sea ice is shrinking by about 3 percent per decade, but the trends are not uniform. While recent studies have indicated that the ice thickness also had decreased over several decades, new information shows that the ice may have thinned rapidly, Armp said. Examination of springtime ice thickness in the Arctic Ocean indicates that the mean ice thickness decreased 1.5 meters (4. 8 feet) between the mid-1980s and early 1990s. To mark its 25th anniversary, the National Snow and Ice Data Center has organized a special session at the 2001 Fall Meeting of American Geophysical Union, taking place this week in San Francisco, that illuminates overall changes in the cryosphere. The session begins Tuesday and extends through Thursday afternoon, with 75 contributions from all areas of cryospheric study. Papers and posters include examinations of lake and river ice, glacier dynamics, and mass ice balance studies in polar and continental glaciers, regional and polar snow cover trends, and variations in Canadian ice cap elevations. |
The special session of the National Snow and Ice Data Center was organized to ______ .
A．attract more contributions to the cryospheric regions
B．make more people realize the threats of climate change
C．stimulate further research into the changes in ice thickness
D．celebrate its 25th anniversary and discuss changes in the cryosphere
