单项选择题

According to the passage, Professor Laura and Mr. Ashton's research on skin cancer _________.

A．is a big challenge to the traditional skin cancer theory
B．has been accepted by the medical world
C．is a new development to the old theory
D．is criticized by medical scientists
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单项选择题
The recipe said to use butter, but as we'd run out we had to _________ with margarine.
A．make do
B．do away
C．do up
D．make up
单项选择题
Our company decided to _________ the contract because a number of the conditions in it had not been met.
A．destroy
B．resist
C．assume
D．cancel
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