单项选择题

A．Pollution of the environment.
B．A new generation of pest killers.
C．Over-killing by hunters.
D．Destruction of their natural homes.
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单项选择题
According to Peter Watson, the most important innovation happens in ______.
A．the cultures we have
B．the way we think
C．the technological advances
D．the subjects we are studying
单项选择题
A．They were too casual.B．They were too dressy.C．They were uncomfortable.D．They were not charming enough.
A．They were too casual.
B．They were too dressy.
C．They were uncomfortable.
D．They were not charming enough.
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