单项选择题

The fragrances of many natural substances come from oils, （） these oils may be used in manufacturing perfumes.

A．of
B．whether
C．from
D．and

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单项选择题
His eyes were injured in a traffic accident, but after a （） operation, he quickly recovered his sight.

A、considerate
B、delicate
C、precise
D、sensitive
单项选择题
The chief foods eaten in any country depend largely on （） best in its climate and soil.

A．it grown
B．does it grown
C．what grows
D．what does it grow
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