收入型组合要实现的目标是风险最小、收入稳定、股价增长较快。 ( )
参考答案：错
单词拼写。
1. What did you see when you passed by the _____(小卖部)?
2. Can Lily and Lucy both play the _____(钢琴)?
3. Do you like light _____(音乐)?
4. What do you do every _____(周末)?
5. Are you going to school by car or by _____(地铁)?
下列各式计算正确的是（ ）
A．（a7）2=a9
B．a7•a2=a14
C．2a2+3a3=5a5
D．（ab）3=a3b3
