模数转换器的字长是指一个数字量用几位（）来表示。
A、十进制
B、八进制
C、十六进制
D、二进制
参考答案：D
按照房地产市场周期理论，房地产售价以比租金快得多的速度上涨、新房交易量大的阶段是（）。
A.上升期
B.高峰期
C.衰退期
D.低谷期
用括号内所给词的适当形式填空
1. I am afraid there _____(be) a meeting this afternoon. I can't join you.
2. My uncle says he _____(come) back in two weeks.
3. We _____ go skating next Sunday.
4. There _____(be) a football match in our school this afternoon.
5. Thank you for _____ (give) me so many beautiful flowers.
