下列阶段的投资估算允许误差率最大的是( )。
A．项目建议书阶段 B．可行性研究阶段C．投资机会研究阶段 D．项目前评估阶段
参考答案：C
我们常常将乐器分为管乐器、弦乐器和敲击乐器，我们可以用耳朵分辨出这三类乐器，这主要是因为这三类乐器发出的声音（ ）
A．音调不同
B．音色不同
C．响度不同
D．在空气中传播的速度不同
根据句意和首字母提示完成单词。
1. Sue has a great sports c________: balls, rackets and so on.
2. —Do you like math? —No, I think it is d________.
3. —Let's play soccer.—No, it's b________.
4. There are some tennis r________ on the floor.
5. —Let's play computer games. —OK. That sounds i________.
6. They play basketball e________ day.
7. Do you have a soccer b________?
8. W________ to our school!
9. It is t________ to watch TV.
10. Do you h________ a tennis bat?
