单项选择题

A．Neither of the two types of rockets is very economical.
B．The liquid-fuel rocket is best.
C．Each type of rocket has certain advantages.
D．The solid-fuel rocket is best.
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单项选择题
A．To encourage them.B．To stop them immediately.C．To give some explanation.D．To leave them alon
A．To encourage them.
B．To stop them immediately.
C．To give some explanation.
D．To leave them alon
单项选择题
A．It is the best city he’s ever visited.B．It was worse than he had expected.C．It is difficult to get around in the city.D．The hotel service is terrible in the city.
A．It is the best city he’s ever visited.
B．It was worse than he had expected.
C．It is difficult to get around in the city.
D．The hotel service is terrible in the city.
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