单项选择题

The underlined word "offset" in the seventh line Paragraph 2 could be replaced by ______.

A．slip into
B．make up for
C．set up
D．catch up with
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单项选择题
In Papousek's experiment babies make learned movements of the head in order to ______.
A．have the lights turned on
B．please their parents
C．be rewarded with milk
D．be praised
单项选择题
In what way can we make a machine intelligent
A．By making it work in such environments as deserts, oceans or space.
B．By working hard for 10 or 20 years.
C．By either properly programming it or changing its structure.
D．By reproducing it.
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