单项选择题


A．remain
B．keep
C．make
D．cause
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单项选择题
We can realise how deeply a finger is put into water at body temperature ______.
A．from the sense of direct touch
B．through the skin contact
C．through the difference in temperature
D．from the even distribution of pressure
单项选择题
Which of the following is TRUE
A．Man is more colour-conscious than the honey-bee.
B．The honey-bee is blind to red.
C．The honey-bee can see far more colours than man.
D．Man is sensitive to the ultra-violet.
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