单项选择题

A．By smelling them.
B．By touching them.
C．By recognizing their voices.
D．By remembering the description of them.
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单项选择题
A．Monday.B．First of May.C．Sunday.D．Saturday.
A．Monday.
B．First of May.
C．Sunday.
D．Saturday.
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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