用所给单词的适当形式填空。

1. Would you like to _____________ (plant) trees?

2. She can _____________ (swim) in the river.

3. Let me _____________ (have) a look.

4. Mary _____________ (read) a book now.

5. Let's _____________ (invite) your parents to the party.

6. She has twelve _____________ (knife).

7. I like collecting _____________ (leaf).

8. Last year Mr. Black _____________ (study) Chinese.

下列说法错误的是( )。

A．非系统性风险可以通过市场得到补偿

B．有效边界是可行集上最小方差组合点到最高预期报酬点之间的曲线

C．存在无风险借贷时，新的有效边界就是资本市场线

D．资本市场线只适用于有效证券组合