鞍区肿瘤平扫示混杂密度影，最可能的诊断是()
A．垂体瘤
B．脑膜瘤
C．颅咽管瘤
D．动脉瘤
E．脊索瘤
参考答案：E
Given that markets are efficient, which of the following is least likely to cause an actively managed mutual fund to underperform an index fund（）
A. Taxes.
B. Inferior stock selection.
C. Management expenses.
世界上最强盛、范围最广的季风是（）。
A．赤道非洲季风
B．南亚季风
C．东亚季风
D．南美季风
