单项选择题

The principal religion of Canada is ______.

A．Roman Catholicism
B．Protestantism
C．Orthodox Church
D．Calvinism
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单项选择题
Which of the following statements is TRUE
A．We see all the colors that animals can see.
B．Sunlight contains all the colors.
C．Color blindness is due to cone problems.
D．Rods are not as sensitive as cones.
单项选择题
The rods of our eyes see ______.
A．colors
B．black and white
C．both colors and black and white
D．visible wavelength colors
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