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问题 单项选择题

计算机的系统总线是计算机各部件问传递信息的公共通道，它分为

A．数据总线和控制总线

B．地址总线和数据总线

C．数据总线、控制总线和地址总线

D．地址总线和控制总线

答案

参考答案：C

解析：解析：按照功能划分，大体上可以分为地址总线和数据总线。

选择题

一列沿x轴传播的简谐波的波源位于坐标原点O，振动方程y=4sin4πt（cm），该波从O点传播到20m处所需要的时间为4s，则波长为（　　）

A．2.5m

B．5m

C．10m

D．20m
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填空题

用括号内所给词的适当形式填空

1. Taking a taxi is                (fast) than taking a bus.

2. Mr. Smith lives the                (far) from the Sun Cinema in the school.

3.I think it's the                (expensive) way of all.

4. Spring is the                 (good) time to plant trees.

5. The Summer Palace is one of                (beautiful) parks in Beijing.

6. The first question is                (easy) one in this exercise.

7. He is one of the                (good) players on the school football team.

8. Which are               (cheap), the apples or the oranges?

9. Travelling by air is the               (fast) way of all.

10. This street is one of the               (busy) streets in this city.
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