NO.PZ2018062007000100
问题如下：
In contrast to gambling, derivatives speculation:
选项：
A. has a positive public image.
B. is a form of financial risk taking.
C. benefits the financial markets and thus society.
解释：
C is correct. Derivatives trading brings extensive benefits to financial markets (low costs, low capital requirements, ease of going short, etc.) and thus benefits society as a whole. Gambling, on the other hand, typically benefits only a limited number of participants. A is incorrect because the general image of speculators is not a good one. Speculators are often thought to be short- term traders who attempt to exploit temporary inefficiencies, caring little about long- term fundamental values. B is incorrect because speculation and gambling are both forms of financial risk taking.
中文解析：
A选项意思是投机有一个正面的公共形象，这是不对的，投机和赌博一样，public image并不是很好；
B选项意思是说投机承担了金融风险，这本身是对的，但这不是与赌博的区别，赌博和投机一样都承担了金融风险，原因是两者都承担了价格的不确定性。
衍生品交易为金融市场带来了广泛的利益(低成本，低资本要求，容易做空等)，从而有利于整个社会。C对。
如题。。。。。。。。。
