制定保险费率的原则是（）
A.公平合理
B.实事求是
C.收支相等
D.相对稳定
E.适时调节
参考答案：A, B, C, D
Mary wrote books to earn money while John gained his wealth ________ selling Mary’s works.
A. with B. by on D. through
按照交易方式，金融衍生工具可以分为（）。
A.远期
B.期货
C.期权
D.信托
E.互换
on D. through