单项选择题

In Papousek's experiment babies make learned movements of the head in order to ______.

A．have the light turned on
B．be rewarded with milk
C．please their parents
D．be praised
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单项选择题
The babies would smile and bubble at the lights because ______.
A．the lights were directly related to some basic "drives"
B．the sight of the lights was interesting
C．they need not turn back to watch the lights
D．they succeeded in "switching on" the lights
单项选择题
During the whole expedition, there were ______ ships lost.
A．two
B．three
C．four
D．five
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