下列关于相关系数的说法，正确的是( )。
A．当相关系数为-1时，两项投资称为完全相关投资
B．当相关系数为-1时，两项投资组合的非系统性风险能完全抵销
C．当相关系数为-1时，两项投资组合的风险收益为零
D．当相关系数为-1时，两项投资组合的收益大于任何一项投资的收益
参考答案：B
解析： 本题的考点是相关系数的运用。当相关系数为-1时，称为完全负相关，即两项资产收益率的变化方向与变化幅度完全相反，表现为此增彼减，可以完全抵消全部投资风险。
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 Ten children from around the world become the universal dream kids (国际儿童之星) 1 of them are from China. They are Liu Danyang from Hubei and He Siqi from Yunnan. He Siqi is a 2 girl from the Naxi ethic group (纳西族). She 3 her spare time learning Naxi language. It's an old 4 . Many kids at her age don't speak it. She can speak it, read and 5 old Naxi characters (文字). "I like to learn it. I should pass it on (传承). I 6 also help the travelers to my hometown," she says. Look! She 7 her classmates old Naxi characters. Liu Danyang is 11 years old. He can't hear well. 8 he is a happy and warm-hearted boy. 9 some classmates like him in his class. When his classmates have troubles (困难), He likes to help them. He is 10 painting. He is a good painter in his classmates' eyes. | |||
| ( )1. A. Three ( )2. A. 14-year-old ( )3. A. takes ( )4. A. country ( )5. A. write ( )6. A. could ( )7. A. is teaching ( )8. A. And ( )9. A. There ( )10. A. is thinking of | B. Third B. 14 years old B. pays B. language B. sing B. may B. is writing B. So B. There have B. good at | C. Two C. 14-year old C. spends C. city C. draw C. have to C. teaches C. Because C. There has C. waiting for | D. Second D. 14-years old D. costs D. sport D. study D. had to D. writes D. But D. There are D. bad for |