单项选择题

The honeybee's sting is particularly effective because it （）

A．has many potential uses
B．can kill several victims at once
C．is located in the rear of the bee's body
D．remains with the bee's victim

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热门试题

单项选择题Hydrogen （）

A．is a widely-used fuel
B．is not yet in general use as a fuel
C．is not a particularly easy fuel to store
D．is a more economical fuel than wind energy

单项选择题Alternative sources of energy （）

A．could not possibly reduce the installed capacity of conventional power stations
B．might not reduce the installed capacity of conventional power stations
C．would automatically reduce the installed capacity of conventional power stations
D．would make it necessary to reduce the installed capacity of conventional power stations