单项选择题

A．Man will probably be able to live there in 200 years.
B．Scientists are rather pessimistic about it.
C．Man will probably be able to live there in 100,000 years’ time.
D．Scientists are optimistic about overcoming the difficulties soon.
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单项选择题
A．The high temperatures required for its use.B．The lack of trained environmental engineers.C．The opposition of automobile manufacturers.D．The high cost of materials used in its production.
A．The high temperatures required for its use.
B．The lack of trained environmental engineers.
C．The opposition of automobile manufacturers.
D．The high cost of materials used in its production.
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