题目内容
（请给出正确答案）
What is a by-product of burned coal？
A. Aluminum, silicon, and magnetic.
B. Paving material.
C. Fly ash.
D. Concrete additive.
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更多“What is a by-product of burned…”相关的问题
In the past, I tried my best to【25】myself happy. I thought if I could freely get and do what I wanted to, I【26】be happy. Certainly, it was possible but I was【27】Though I could be happy at times, I couldn't keep my happiness for a long time. Why？ One day, when I told a friend of mine what I【28】about happiness, he smiled and said only a few words, "Happiness is not a single thing but a by- product(副产品)." I was surprised, but he was really【29】
Someone thinks money can【30】everything, but when he becomes a millionaire after his work, perhaps he【31】find that he has new【32】. And he has to go to church for【33】. Sometimes love can bring happiness,【34】at other times it【35】misunderstanding, tiredness, and even quarrelling. Happiness is only a by-product of all【36】of things you love to do. You can not grasp it in a【37】way. That is, it is not a thing existing in material form. but in your senses. You should tell yourself, "I do not【38】whether I'm happy or not. But I must love my life." And one day you will suddenly find happiness【39】has quietly【40】.
(41)
A．what
B．that
C．which
D．it
According to the passage, materialism ______.
A．is a by-product of capitalism
B．originated from the circles of the rich
C．was first created among the middle class
D．is not popular in the developing world
Fly ash can partly take the place of ______.
A. paving material
B. cement
C. concrete
D. the coal by-product
According to government statistics, in the United States, there are over 110 million cars and "more people" means "more cars". By the end of twenties of next century, the population of the United States will have doubled that of today and the number of automobiles will be doubled as well. And in twenty-year's time the per capita income will also be 2.5 times higher than it is. If this increase income is spent on more and larger automobiles, larger houses, and increased consumption of other material goods, the results could cause catastrophic resource exhaustion, and pollution. Take the increase of the consumption of oil for instance. The consumption is so huge that the reserves might last only a decade or two if not supplemented by imports.
Ten years ago it appeared that nuclear power would solve the anticipated energy crisis. Although supplies of uranium fuel were known to be limited and might become exhausted in half a century, the nuclear power plant has for a long time been a favorite project. But work on it has met with grave problems. The fear of possible atomic explosion and the problem of disposing of polluting by-product waste have slowed down the construction of further nuclear plants. Eventually atomic technology may be able to control these problems, but at present there seems to be little agreement among atomic scientists about when this can be achieved.
Which of the trend is true？
A．The population will increase, but the income will decrease.
B．The population will decrease, but the income will increase.
C．Both will increase.
D．Both will decrease.
