收集第一手资料通常花费较大、周期长，但能掌握市场的即时信息。 ()
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How do brains work according to the text？
A. Brains decide according to the consciousness.
Brains decide according to the subconsciousness.
C. Brains decide before their owners know about it.
D. Brains decide after their owners know about it.
By saying "a victim of its own ubiquity and the industry's conservative pace of development"(Line 5-6, Para. 1) , the author means that
A. concrete suffers from its widely application as well as the slow development of building industry.
B. concrete is not appreciated because of its dull color and other drawbacks, with little improvement as a building material.
C. slow progress of building industry does harm to the application and popularity of concrete.
D. concrete is ignored because it is conventional with little advance in its technology.
By saying "it was the concrete age"(Line 3, Para. 1), Van Oss means that
A. the traditional building material concrete is the only man-made miracle.
B. concrete is indispensable in the development of modern construction industry.
C. compared with other inventions, concrete is more practical and useful.
D. concrete, as a building material, can be mixed with any other materials.
According to the text, concrete is also a "climate-change villain" mainly because
A. sand or gravel has to be used as an aggregate in the process of mixing.
B. the materials which are used to make concrete are not durable.
C. recycling of concrete is quite difficult when concrete breaks down.
D. chemical reaction in manufacturing cement emits carbon-dioxide world-wide.
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