单项选择题

A．Every ten minutes.
B．At twenty to one.
C．Every half-hour.
D．Once a day.
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单项选择题
A．The threat of poisonous desert animals and plants.B．The exhaustion of energy resources.C．The destruction of oil wells.D．The spread of the black powder from the fires.
A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of oil wells.
D．The spread of the black powder from the fires.
单项选择题
A．She lakes it as a kind of exercise.B．She wants to save money.C．She loves doing anything that is new.D．Her school isn’t very far.
A．She lakes it as a kind of exercise.
B．She wants to save money.
C．She loves doing anything that is new.
D．Her school isn’t very far.
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