CRT的施测时间长度是（ ）分钟。
A．40
B．50
C．60
D．70
参考答案：A
六年级99名同学参加体育测试全部达标，达标率为99%．______．
The level of diversification benefits available from investing internationally is determined by the:（）
A. relative returns between markets.
B. correlations between market returns.
C. standard deviations of the returns.
