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【单选题】
建造大型温室和大棚，最少应有多长的漫坡地（）A.
100m
B.
150m
C.
200m
D.
250m
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举一反三
【单选题】The Adventures of Huckleberry Finn, _______ the USA in the mid 19th century, _______ a masterpiece.
A.
set in; proves
B.
setting in; is proved
C.
is set in; proves
D.
was set in; is proved
【单选题】We can infer that the author of this passage ______.
A.
disapproves of Roosevelt's 'New Deal'
B.
thinks the Depression could have been avoided
C.
blames the Depression on the 'Great Crash'
D.
feels there was some similarity between Roosevelt and Hitler
【单选题】The major problems with America's railroad system in the mid 19th century lay in______.
A.
poor quality rails and unreliable stopping systems
B.
lack of financial support for development
C.
limited railroad lines
D.
lack of a transcontinental railroad
【单选题】By the mid-1980s, farmers in Denmark ______.
A.
used 50 per cent less fertiliser than Dutch farmers.
B.
used twice as much fertiliser as they had in 1960.
C.
applied fertiliser much more frequently than in 1960.
D.
more than doubled the amount of pesticide they used in just 3 years.
【简答题】黄曲霉毒素( AFT 或 AT )是由 和 产生的一类代谢产物,具有极强的毒性和致癌性,基本结构中均有一个 和一个 。
【单选题】The major problems with America's railroad system in the mid 19th century lay in ______.
A.
limited railroad lines
B.
lack of a transcontinental railroad
C.
lack of financial support of development
D.
poor quality rails and unreliable stopping systems
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