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【单选题】

The work on atmospheric chlorofiuorocarbons (氯氟化碳) led ually to a global CFC ban that saved us from ozone-layer reduction. Do we have time to do a similar thing with carbon emissions to save ourselves from climate change
Not a hope at all. Most of the "green" stuff is very close to a big trick. Carbon trading, with its huge government grants, is just what finance and industry wanted. It’s not going to do a thing about climate change, but it’ll make a lot of money for a lot of people and postpone the moment of reckoning.
I am not against renewable energy, but to spoil all the decent countryside in the UK with wind farms is driving me mad. It’s absolutely unnecessary, and it takes 2,500 square kilometers to produce a gigawatt (十亿瓦特)—that’s an awful lot of countryside.
Work to sequester (隔离) CO2 (carbon dioxide) is also a waste of time. It’s a crazyidea—and erous. It would take so long and use so much energy that it will not bedone.
And, nuclear power is a way for the UK to solve its energy problems, but it is not aglobal cure for climate change. It is too late for emissions reduction measures.
Yet we are not doomed. There is one way we could save ourselves and that is through the massive burial of charcoal (木炭) . It would mean farmers turning all their agricultural waste—which contains carbon that the plants have spent the summer sequestering—into charcoal, and burying it in the soil. Then you can start shifting vast quantities of carbon out of the system and pull the CO2 down quite fast.
What we can do is getting farmers to bum their crop waste at very low oxygen levels to turn it into charcoal, which the farmer then ploughs into the field. A little CO2 is released but the bulk of it gets converted to carbon. You get a few per cent of bio-fuel as an additional product of the burning process, which the farmer can sell. This scheme would need no subsidy (补贴) : the farmer would make a profit. This is the one thing we can do that will make a difference.
According to the passage, one advantage of the author’s proposal is that ______.

A.
it can produce charcoal most of which can be used as fuel
B.
it doesn’t involve any international cooperation or negotiation
C.
it brings extra income to farmers and saves government money
D.
it needs no advanced technology or expensive equipment
题目标签:瓦特隔离氟化
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【单选题】应用氟化食盐越早,防龋效果越好的恒牙是

A.
中切牙
B.
侧切牙
C.
尖牙
D.
双尖牙
E.
第一恒磨牙

【单选题】氟化胺的特点不包括()。

A.
典型的表面活性剂
B.
有金属味
C.
可增加牙釉质的氟摄取和沉积
D.
增强釉质的抗酸能力并促进早期龋损的再矿化
E.
毒性低

【单选题】麻疹的隔离期是

A.
隔离到起病后1周
B.
隔离到出疹后1周
C.
无并发症隔离到出疹后5天,有并发症隔离到出疹后10天
D.
隔离到疹退后10天

【单选题】氟化凝胶的浓度是

A.
0.1%.
B.
1%.
C.
1.23%.
D.
2%.
E.
8%~10%