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单项选择题

A．They’re expensive.
B．They’re much faster than hydrogen balloons.
C．They are more frequently used in the United States.
D．They’re a lot safer than hot-air balloons.
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单项选择题A．To keep the heat inside,B．To prevent insects from escaping.C．To reduce the risk of fire,D．To keep the wood dry.

A．To keep the heat inside,
B．To prevent insects from escaping.
C．To reduce the risk of fire,
D．To keep the wood dry.

单项选择题A．A storm can hardly change the direction of an ocean current.B．The loss of sneakers in the storm put the company in the financial difficulty.C．Not all useful experiments are planned ahead of time.D．Computers cannot always predict the effects of ocean storms.

A．A storm can hardly change the direction of an ocean current.
B．The loss of sneakers in the storm put the company in the financial difficulty.
C．Not all useful experiments are planned ahead of time.
D．Computers cannot always predict the effects of ocean storms.