单项选择题

We learn from the passage that passage that a storm follows a change in ______.

A．humidity
B．temperature
C．air pressure
D．moisture
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单项选择题
What does the author mean when he interprets the urge for a sharper focus
A．The US will be justified in cutting its financial contribution.
B．More heated arguments will be unavoidable between richer and poorer countries.
C．There should be better service for poorer countries but no cost - cutting.
D．The poorer countries will not receive more benefits.
单项选择题
What is the author's attitude towards advertising
A．Negative.
B．Positive.
C．Indifferent
D．Not clear
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