单项选择题

A．Because it was misprinted a hundred years ago.
B．Because it is rare and old.
C．Because few collectors have it.
D．Because it was made in British colonies.
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H
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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