与市场组合的夏普指数相比，一个高的夏普指数表明( )。
A．该组合位于市场线上方，该管理者比市场经营得差
B．该组合位于市场线上方，该管理者比市场经营得好
C．该组合位于市场线下方，该管理者比市场经营得差
D．该组合位于市场线下方，该管理者比市场经营得好
参考答案：B
解析： 夏普指数等于证券组合的风险溢价除以标准差，是连接证券组合与无风险资产的直线的斜率。与市场组合的夏普指数相比，一个高的夏普指数表明该管理者比市场经营得好，该组合位于资本市场线上方。
| 短文填空。根据短文内容，从方框内选择合适的单词并用其适当形式填空，使短文完整、连贯。 | |
 nd reading e-mail have become one of the most popular daily activities around the world, either for business or for pleasure. Now, more and more teachers and students are (1)_____this form (形式) of communication to (2)_____their language skills, particularly in English. E-mail has become so popular because it's quite (3)_____. In the past, teachers often (4)_____ pen pal projects so that their students could (5)____ideas with their pen pals. But sending and (6)_____ paper letters could take a few weeks sometimes, so students might lose (7)_____in the project some day. Now with e-mail, (8)_____, messages can be sent or received (9)_____on the Internet. (10)_____ of waiting for days or weeks, students can receive a reply during days, hours, or even minutes. |