阅读理解。

    I'm at Billy's birthday party. There are a lot of friends in his house. Some stand beside the table and enjoy

the snacks and drinks. There is some food on the table. I like the chocolate and the fruit very much. Billy sits

in the sofa and chats with some friends there. He wears a red T-shirt and a pair of blue jeans. He looks so cool

today. Wow! The cake is really big. There are some candles on it. Billy's friends begin to sing "Happy Birthday"

to Billy. Billy is very excited. He blows out the candles (吹蜡烛) and cuts the cake. Everyone has fun at the

party.

1. There are a lot of friends at ______ birthday party. [ ]

A. Millie's

B. Billy's

C. my

D. Jim's

2. Billy wears ______. [ ]

A. a blue T-shirt

B. a red shirt and a pair of blue jeans

C. a red T-shirt and a pair of blue jeans

D. a yellow shirt

3. Billy looks ______ today. [ ]

A. cool

B. sad

C. polite

D. helpful

银行进行证券投资时，只考虑单个证券的风险以及全部证券的组合风险即可。