单项选择题


A．ask
B．call
C．appeal
D．look
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单项选择题
Commercial application of the research finding will be possible ff salad cream can be made resistant tobacterial attack ______
A．by varying its chemical composition
B．by turning it into a solid lump
C．while keeping its structure unchanged
D．while retaining its liquid form
单项选择题
I have had my eyes tested and the report says that my ______is perfect.
A．vision
B．horizon
C．outlook
D．perspective
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