单项选择题

A．Once a week.
B．Twice a week.
C．Once a month.
D．Twice a month.
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单项选择题
A．$5.50.B．$4.50.C．$3.50.D．$2.50.
A．$5.50.
B．$4.50.
C．$3.50.
D．$2.50.
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.
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