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（10分）【地理—环境保护】阅读材料，完成下列各题。 2014年2月22日前后几天，雾霾天气笼罩中国中东部大部地区。据有有关监测显示，在此期间，北京、河北、山东等多地空气中PM2.5指数直逼最大值（严重超标）。PM2.5是指大气中直径小于或等于2.5微米的颗粒物，也称为可入肺颗粒物，主要来自扬尘、机动车尾气、燃煤及挥发性有机物等，它对空气质量和能见度等有重要影响。 (1)试分析此次多地PM2.5指数严重超标的原因。（4分） (2) 针对目前状况，在个人以及政府层面，你对防范该天气有什么建议？（6分）
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【单选题】What is the professor's opinion of The Medium is the Message?
A.
It is a good source of information about cultural history.
B.
Its ideas are becoming less relevant today than in the past.
C.
It was the first book to argue that television was bad for society.
D.
It will influence how the students think about communication.
【单选题】In my hometown, the old over 100 years old __ not only by their family but also by the government . A. B. good care of C. is taken good care of D. are take good care of
A.
is taken good care
B.
are taken good care
C.
is taken good care of
D.
are taken good care of
【单选题】The cross elasticity of demand for good X with respect to the price of good Y is negative. Good X is a normal good and good Y is an inferior good. The supply of good X is perfectly elastic. A rise in ...
A.
will raise
B.
will lower
C.
will have no effect
D.
initially raise and then lower
【单选题】The marginal benefit of a good is a measure of
A.
the price of the good.
B.
consumer surplus.
C.
how much a consumer values another unit of the good.
D.
the total utility that the consumer gets from the good.
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