单项选择题

Niagara Falls is a great tourist ___________ drawing millions of visitors every year.

A．attention
B．attraction
C．appointment
D．arrangement
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单项选择题
She ought to stop work; she has a headache because she ___________ too long.
A．has been reading
B．had read
C．is reading
D．read
单项选择题
Commercial application of the research finding will be possible if salad cream can be made resistant to bacterial 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
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