单项选择题

A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of energy resources.
D．The spread of the black powder from the fires.
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单项选择题
A．Fellow teachers.B．Freshmen of a university.C．Second-year students.D．Either seniors or juniors.
A．Fellow teachers.
B．Freshmen of a university.
C．Second-year students.
D．Either seniors or juniors.
单项选择题
A．logicB．writingC．historyD．mathematics
A．logic
B．writing
C．history
D．mathematics
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