单项选择题

The most important environmental influence on fish is water temperature, for fish tend to ______ the temperature of their surroundings.

A．avoid
B．exceed
C．assume
D．regulate
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单项选择题
So little ______ about mathematics that the lecture was completely beyond me.
A．I knew
B．do I know
C．did I know
D．have I known
单项选择题
Have you got some red eggs No, but I've got ______ .
A．any white ones
B．some white ones
C．some white one
D．any white one
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