单选题 The author believes that our knowledge of social systems is more secure than that of physical system because ______.

A、 it is not based on personal experience
B、 new discoveries are less likely to occur in social sciences
C、 it is based on a fairly representative quantity of data
D、 the records of social systems are more reliable

【正确答案】 B

【答案解析】第1段第5句说：Our knowledge of social systems...is not likely to be seriously overturned by new discoveries. 而第2段首句说：In contrast，our image of the astronomical universe...can easily be subject to(受……支配的)revolutionary changes...言下之意，社会科学方面不容易出现新发现。A项与第1段最后一句相矛盾,...even though it is built upon the very imperfect samples of personal experience。C项在文中没有提及。D项则明显与本文不符。