单项选择题

Scientists in Brazil have used frog skin to （）.

A．eliminate bacteria.
B．treat burns.
C．speed up recovery.
D．reduce treatment cost.

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单项选择题
Professor McKay is （） towards the tendency of more parents living apart from their children.

A．negative
B．positive
C．ambiguous
D．neutral
单项选择题
According to Professor McKay’’s report, （）.

A．family love is gradually disappearing.
B．it is hard to comment on family feeling.
C．more children are indifferent to their parents.
D．family love remains as strong as ever.
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