降价是市场上常见的促销方式。但为什么餐饮业可以降价促销，而中小学教科书不宜采用降价促销的方式。用需求弹性理论解释这种现象。

Tony Blair is the leader of the Labour party at present.

#A.对#B.错

This product performed very well in experiment.

#A.对#B.错

This passage tells applicants how to relieve tension in an interview.

#A.对#B.错

This new kind of smart anti-theft devices were assembled in China.

#A.对#B.错

This is a win-win situation we'd like to encourage.

#A.对#B.错

简述增值税特征。

The service manual schematics will not help you to see system power, ground, input, and output circuits.

#A.对#B.错

The service industry in the UK employs 70% of the total work force

#A.对#B.错

简述园林植物群落的概念与特点