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问题 单项选择题

（）是假设资产组合未来收益变化与过去是一致的，利用各组成资产收益率的历史数据计算现有组合收益率的可能分布，直接按照VaR的定义来计算风险价值。

A．历史模拟法

B．方差—协方差法

C．蒙特卡罗模拟法

D．标准法

答案

参考答案：A

解析：

本题考查的是对历史模拟法的理解。

单项选择题

患者，女性，25岁。感冒后发热2周，随后出现皮肤紫癜，月经过多，检查发现血小板34×109/L，白细胞4.2×109/L，血红蛋白115g/L，骨髓穿刺：巨核细胞125个，分类未见产板巨核细胞。首选何种治疗( )

A．肾上腺皮质激素
B．脾切除
C．免疫抑制剂
D．丙种球蛋白
E．铁剂
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单项选择题

"Sesame Street" has been called "the longest street in the world". That is because the television program by that name can now be seen in so many parts of the world. That program became one of American’s exports soon after it went on the air in New York in 1969.
In the United States more than six million children watch the program regularly. The viewers include more than half the nation’s pre-school children, from every kind of economic, racial, and geographical group.
Although some educators object to certain elements in the program, parents praise it highly. Many teachers also consider it a great help, though some teachers find that problems arise when first graders who have learned from "Sesame Street" are in the same class with children who have not watched the program.
Tests have shown that children from all racial, geographical, and economic backgrounds have benefited from watching it. Those who watch it five times a week learn more than occasional viewers. In the US the program is shown at different hours during the week in order to increase the number of children who can watch it regularly.
The programs all use songs, stories, jokes, and pictures to give children a basic understanding of numbers, letters and human relationships. But there are some differences. For example, the Spanish program, produced in Mexico City, devotes more time to teaching whole words than to teaching separate letters.
Why has "Sesame Street" been so much more successful than other children’s shows Many reasons have been suggested. People mention the educational theories of its creators, the support by the government and private businesses, and the skillful use of a variety of TV tricks. Perhaps an equally important reason is that mothers watch it along with their children. This is partly because famous adult stars often appear on it. But the best reason for the success of the program may be that it makes every child watching feel able to learn. The child finds himself learning, and he wants to learn more.

What is special about the program

A. It offers great fun.
B. It makes children feel able to learn.
C. It is shown at different hours during the week.
D. Children learn and enjoy themselves while watching.
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