问题
选择题
He likes _______ and _______.
A. sing, dance
B. to singing, dancing
C. singing, dancing
D. to sing, dance
答案
答案：C
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He likes _______ and _______.
A. sing, dance
B. to singing, dancing
C. singing, dancing
D. to sing, dance
答案：C
债券指数与沪深300指数（视为市场组合）的相关系数为-0.5。货币市场基金的预期收益率为3%，可以视为无风险资产。