单项选择题

According to the passage, humans ______.

A．can control the robots by program
B．can work a day in unpleasant surroundings
C．has a mechanical arm and a metal hand
D．didn't have a head
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单项选择题
By the end of this July, ______ English for six year.
A．is studying
B．have studied
C．has studied
D．shall have studied
单项选择题
______ a reply, she decided to write again.
A．Not receiving
B．Receiving not
C．Not having received
D．Having not received
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