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
A．To allow several sails to be rigged.B．To add to the beauty of the basic design.C．To catch winds coming from over the hills.D．To allow the sails to be raised more quickly.
A．To allow several sails to be rigged.
B．To add to the beauty of the basic design.
C．To catch winds coming from over the hills.
D．To allow the sails to be raised more quickly.
单项选择题
A．People are more destructive.B．People are more selfish.C．People do what they preach now.D．People do not have moral principles to follow now.
A．People are more destructive.
B．People are more selfish.
C．People do what they preach now.
D．People do not have moral principles to follow now.
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