单项选择题

A．The high temperatures required for its use.
B．The high cost of materials used in its production.
C．The lack of trained environmental engineers.
D．The opposition of automobile manufacturers.
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单项选择题
Two Australian billionaires have been placed on the waiting list for entering space as private passengers.
A．Y
B．N
C．NG
单项选择题
A．Pollution of the environment.B．Over-killing by hunters.C．Destruction of their natural homes.D．A new generation of pest killers.
A．Pollution of the environment.
B．Over-killing by hunters.
C．Destruction of their natural homes.
D．A new generation of pest killers.
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