经纪这种中介服务活动可以提高交易效率、降低交易成本，是一种(

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问题单项选择题

经纪这种中介服务活动可以提高交易效率、降低交易成本，是一种( )的经济活动。

A．有形
B．无偿
C．无形
D．有偿

答案

参考答案：D

解析：经纪这种中介服务活动可以提高交易效率、降低交易成本，是一种有偿的经济活动。

选择题

( )1. A. Today is Amy's birthday. She has a birthday party with her friends. B. Amy likes sports. She plays tennis with her friends once a week. C. Amy has many hobbies. She often plays chess with Tom.
( )2. A. I never go to the concert. B. I go hiking twice a week. C. I play ping-pong every day.
( )3. A. Jack is taller than Ted. B. Ted is taller than Jack. C. Jack is shorter than Ted.
( )4. A. I often practice the piano after supper at home. B. I often do the dishes after supper. C. I often wash clothes after supper
( )5. A. I played basketball yesterday. B. I had a dance lesson last week. C. I don't like playing the flute, it's boring.

单项选择题

一个人的寿命按60岁算，每天吸一包烟会减寿7年，在一座百万千瓦级核电厂工作接受核辐射会减寿（）。注：一座百万千瓦级核电厂周围的居民多接受的辐照剂量为0.048毫希沃特/年，与每天吸1支香烟的辐照剂量相当。

A、1年

B、24天

C、24秒