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【单选题】
石油炼油厂的炼油实际上是( )。A.
将小分子烷烃聚合为大分子烷烃
B.
将大分子烷烃裂化为小分子烷烃 、烯烃
C.
将液体烷烃转化为天然气
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【简答题】Wood is becoming s______( 紧缺 )in the country and a new material must be found to replace it.
【简答题】A. It's being drained from Nebraska to Texas. B. It's being pumped out. C. It's becoming contaminated with oil D. It's becoming much warmer.
【单选题】In the sentence 'an area covering 30% of the earth's land surface is desert, becoming desert, or in danger of becoming desert' , the part of ' is desert, becoming desert, or in danger of becoming dese...
A.
is becoming desert, has become desert, or will becoming into desert
B.
has been desert, is becoming desert, or will become into desert
C.
is becoming desert, will become desert, or becomes into desert
D.
has been desert, is becoming desert, or will become into desert
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