能量密度
参考答案：
指在一定的质量、空间或面积内，从某种能源实际所能得到的能量或功率。
用所给单词的适当形式填空。
1. I think going bike _____ (ride) is very interesting.
2. I really need _____ (have) a good rest.
3. He thought about _____ (go) to Beijing or Shanghai.
4. They decided on _____ (meet) once a week.
5. This is an _____ (excite) birthday party for her brother.
如果某证券的β值为1．5，若市场投资组合的风险溢价水平为10％，则该证券的风险溢价水平为（ ）。
A．5％
B．15％
C．50％
D．85％
