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如某投资组合由收益呈完全负相关的两只股票构成，在该组合的标准差为零时，组合的风险被全部消除。 ()
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听力原文：M: Hi Jane, it's nice to see you again. I heard you went to the US during your vacation.
W: Yes. I went to New York to attend a summer course in English.
M: Wow. You were lucky. How long did you stay there？
W: About 50 days. I went there on July 5th and came back on August 25th.
M: How about the course？
W: The course was very good. The teachers were nice. They taught us to listen, speak, read and write in English, but it was mostly speaking. One interesting thing I found is freedom. You can sit anywhere you like in the classroom. You can ask the teacher questions at any time during the class, and you are welcome to share your ideas with the class. I really liked this kind of class.
M: How interesting! Maybe our teacher should try that.
What was the woman's main purpose of going to New York during the vacation？
左心室后负荷增加可见于
在动物中脑上、下丘之间横断脑干可出现
由一个夹牛肉的小圆面包构成的三明治(品目号 16.02)和法式炸土豆片(品目号20.04)包装在一起的成套物品，该物品应归人品目号20.04。
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