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【单选题】
嫁接技术中齐是指()对齐A.
形成层
B.
韧皮部
C.
木质部
D.
维管束
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举一反三
【单选题】-----Did you have a hard time traveling back home? -----Yes, it ______ for four days when I arrived in Guiyang and all the roads______ covered with ice.
A.
snowed, were
B.
was snowing, had been
C.
had been snowing, had been
D.
had snowed, were
【单选题】The passage mainly discusses ______.
A.
the differences in average income among countries
B.
the relationship between productivity and living standards
C.
the causes of the rise in living standards
D.
the importance of raising productivity
【简答题】What are similarities and differences among the FOB , CFR and CIF?
【多选题】There are great differences among ____________, ______________, _____________.
A.
different kinds of coal
B.
different parts of the different components of coal
C.
different coal seams of the same region
D.
different parts of the same kind of coal
【简答题】The evolution theory explains the differences in sleep among animals.英译汉
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