单项选择题

According to the passage, the experience of helplessness causes rats to ________.

A．try to control unpleasant stimuli
B．turn off the electricity
C．behave passively in controllable situations
D．become abnormally suspicious
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单项选择题
Whom was probably the wheel invented by
A．A group of early hunters.
B．The first man on earth.
C．A great prehistoric thinker.
D．The man who made the first cart.
单项选择题
Why did John Hancock make his signature large
A．In order that people would see his signature.
B．In order that it would show that he was proud to be a patriot.
C．In order that John Bull could read it without his glasses.
D．In order that he would be remembered as one of the signers.
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