SECTION 3Directions: Each passage in this group is followed by questions based on its cont

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.

Line 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