单项选择题

Talk to anyone in the drug industry,______ you'll soon discover that the science of genetics is the biggest firing to hit drug research since penicillin was discovered.

A．or
B．and
C．for
D．so
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单项选择题
Certain pine trees are deliberately dwarfed for______ purposes.
A．constructive
B．dimensions
C．ornamental
D．decorated
单项选择题
The teacher asked a very difficult question, but finally Ted______ a satisfactory answer.
A．came with
B．came up
C．came up with
D．came up for
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