SECTION 3
Directions: Each passage in this group is followed by questions based on its content. After reading a passage, choose the best answer to each question. Answer all questions following a passage on the basis of what is stated or implied in the passage.
Air turbulence can substantially accelerate the appearance of large droplets
triggering rain by presenting a new mechanism, the "sling effect", which
increases collisions of droplets that have become detached from the airflow.
First, vapor condensation in cloud cores produces small droplets resembling one
(5) another in size, which then expand to raindrop size by coalescing under the
effects of air turbulence—a force thought to cause collisions of similar-sized
droplets whose radii exceed a few micrometers. Then, turbulent vortices act as
small centrifuges that spin heavy droplets out, creating concentration
heterogeneities and jets of droplets, both of which increase the mean collision
(10) rate, which in turn accelerates rain initiation.
One can conclude that rain prediction requires a quantitative description of
droplet collision in turbulence, a mechanism which helps meteorologists to
forecast rainfall, but detailed understanding of the phenomenon entails
consideration of such factors as warm and cold fronts stretching over hundreds
(15) of miles, individual clouds perhaps a mile or so across, and even, as the
mechanism illustrates, tiny eddies perhaps a few centimeters or so in size.
The primary purpose of the passage is to
A.explain and resolve a controversy among meteorologists
B.present and describe a recently discovered phenomenon
C.suggest and prove a theory on the cause of a phenomenon
D.describe and confirm research findings under question
E.discuss and evaluate the soundness of certain experimental observations
第1题
为明确诊断,最有意义的血实验室检查是
A.ASO与血浆蛋白电泳
B.ASO与ESR
C.ESR与血BUN
D.血BUN与Cr
E.ESR与C3
第3题
A.ASO与ESR
B.ASO与血浆蛋白电泳
C.ESR与补体C
D.ESR与BUN
E.血BUN与Cr
第4题
(共用题千) 患儿,8岁,水肿,尿色红2d入院,查 为明确诊断,最有意义的检查是
A.AS0与ESR
B.AS0与血浆蛋白电泳
C.ESR与补体C3
D.ESR与BUN
E.血BUN与Cr
第5题
A.ASO与ESR
B.ASO与血浆蛋白电泳
C.ASO与补体C3
D.ESR与血BUN
E.血BUN与Cr
第6题
8岁,女孩,水肿,尿色红2天入院,查体:颜面、眼睑水肿,心肺听诊无异常,尿常规有红细胞(),蛋白(),患儿半个月前患过扁桃体炎。
为明确诊断,最有意义的检查是
A.ASO与ESR
B.ASO与血BUN
C.ESR与补体C3
D.血BUN与Cr
E.ASO与血浆蛋白电泳
第7题
男性,8岁。水肿,尿色红2天入院,查体:颜面眼睑水肿,心肺听诊无异常。尿常规有红细胞(+++),蛋白(+),患儿半月前患扁桃体炎。
为明确诊断,最有意义的检查为
A.ASO或ESR
B.ASO与血浆蛋白电泳
C.ASO与补体C3
D.ESR与血BUN
E.血BUN与Cr
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