单项选择题

A．It sends signal in the form of electrical impulses.
B．It sends signal in the form of machines.
C．It sends signal in the form of instructions
D．It sends signal in the form of automatic impulses.
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单项选择题
A．It is illegal.B．It is bad.C．It is unfair.D．It is acceptable.
A．It is illegal.
B．It is bad.
C．It is unfair.
D．It is acceptable.
单项选择题
A．Some pessimistic experts.B．Environmentalists.C．Some optimistic experts.D．All of the above.
A．Some pessimistic experts.
B．Environmentalists.
C．Some optimistic experts.
D．All of the above.
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