单项选择题

The two factors concerning hurricanes that scientists most want to learn about are

A．conditions in the "eye" and conditions at the edge.
B．the forces that generate them and their frequency.
C．the number of people injured and the amount of damage done.
D．how fast and where they move.

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单项选择题

Compared with those small towns, people in large cities have

A．less self-discipline.
B．better sense of discipline.
C．more mutual respect.
D．less effective government.

单项选择题

According to Dr. Sheets, the main danger of an error in hurricane prediction is that

A．seeding will prove to be a waste of time and money.
B．people won't pay attention to predictions in the future.
C．money spent on preparation will be wasted.
D．a hurricane may hit an economic center like New York.