商业承兑汇票既可以由付款人签发，也可以由收款人签发。（）
参考答案：对
满足A∪{1}={1，2}的集合A的个数为（ ）
A．1
B．2
C．3
D．4
用所给词的适当形式填空。
1. Do you enjoy _____ (stay) here?
2. How about _____ (go) fishing in the afternoon?
3. They _____ (go) to Hawaii this week.
4. The govemment plans_____ (build) a bridge.
5. Are you going _____ (camp) this weekend?
6. I'm going to the beach with _____ (she).
