单项选择题

If someone is in the United States for good, it means he is there ______ .

A．to do good
B．temporarily
C．to rest well
D．permanently
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单项选择题
According to the passage, bats and adult owls cannot see colours ______ .
A．because they hunt at night
B．because they cannot see light
C．because they have no cones and rods
D．because they have no cones
单项选择题
When millions of rods in oar eyes are at work in darkness we can see ______ .
A．colours only
B．shapes and colours
C．shapes only
D．darkness only
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