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.
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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.
It can be inferred from the last paragraph that
A. the ban on cousin marriages is lifted.
B. cousin marriages are permitted again.
C. the prejudice against cousin marriages dies hard.
D. cousin marriages may not be as bad as people think.
The expression "forestall the market"(Line 1, Para. 3) probably means
A. to buy goods from a stall outside the market place.
B. to acquire goods in quantity before the market.
C. to have the best and the first stall in the market.
D. to sell at a higher price than competitors.
It is suggested in the last paragraph that craft guilds
A. enforced regulations that were unfair and unreasonable.
B. enforced regulations in the interest of the customers.
C. regulated the business of their town to profit the craftsmen.
D. were developed to forbid the monopoly.
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