单选题
The author provides information that answers which of the following questions? Ⅰ. How does the small area's increasing density affect its gravitational field? Ⅱ. What causes the disturbance that changes the cloud from its original static state? Ⅲ. What is the end result of the gradually increas-ing concentration of the small area of gas?
【正确答案】
D
【答案解析】You can answer this question by the process of elimination.
Question I is answerable on the basis of the passage. As the area's density increases, its gravitational field increases in strength.
Therefore, you can eliminate Choice B. Question Ⅱ is not answerable on the basis of the passage. The passage nowhere states what disturbs the gas. Therefore, you can eliminate Choices C and E.
Question Ⅲ is answerable on the basis of the passage. The end result of the process is the formation of a gravitationally bound object, a newborn star. Therefore, you can eliminate Choice A.
Only Choice D is left. It is the correct answer.