句型转换（每空0.5分，计8分）
小题1:They are going to have a sports meet next week. （改为一般疑问句）
_____ they _____ to have a sports meet next week?
小题2:Michael is good at skating? （同义句改写）
Michael _______ ______ in skating.
小题3:He had to take care of his mother after school （同义句改写）
He had to _______ ______ his mother after school.
小题4:We should brush our teeth twice a day. （划线提问）
______ ______ should we brush our teeth?
小题5:Going to bed late is bad for your health. （同义句改写）
______ ______ late is bad for your health.
小题6:You had better play sports right after meals. （改为否定句）
You _____ ______ ______ play sports right after meals.
小题7:I have been like this for two days. （划线提问）
_____ _____ have you been like this?
小题8:Must I be here on time tomorrow? （做否定回答）
No, you ________.
。国库券的收益率为6%，而某一资产组合的预期收益率和标准差分别为14%和20%。要使该投资者更偏好风险资产组合，其风险厌恶程度不能超过多少要使该投资者更偏好国库券，其风险厌恶程度不能低于多少