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问题 单项选择题

下列说法正确的是( )。

A．设备的自然寿命可以作为设备更新的依据
B．科学进步越快，设备的技术寿命越长
C．设备的技术寿命可以作为设备更新的依据
D．设备的技术构成影响着设备的寿命期限

答案

参考答案：D

阅读理解

读一读，判断正误。正确的写“T”，错误的写“F”。

      Look at the picture. This is my happy family. I have a brother and a sister. My brother works in Hainan; he

is a cashier in a big supermarket. My sister works in Beijing. She is a waitress in Beijing Hotel. My mother is a

businesswoman. She works in an office building. She is very busy. My father is a teacher; he has no classes

on Sundays and Saturdays. So he often goes shopping for my family.

( ) 1. My father is very busy. He is a businessman.

( ) 2. My mother works in an office building.

( ) 3. My sister is a waitress. She works in Beijing.

( ) 4. There are four people in my family.
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选择题

为应对2009年下半年出现的新一轮“电荒”问题，一些省、市出台了实施分时电价的措施。所谓分时电价，即在用电高峰时，提高电价，用电低谷时实行平价或适当降价。实施“分时电价”的经济学依据是

[ ]

A．价值决定价格

B．供求关系影响价格

C．价格影响供求关系

D．供求关系决定价格

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