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
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单项选择题
According to the passage, dogs and cats,
A．as well as human beings can not see some colours
B．have fewer cones than human beings
C．have less rods than human beings
D．can see colours as well as human beings
单项选择题
Which of the following statements is NOT TRUE
A．Very high expectations for the individual make him more prone to depression.
B．A depressed person feels sad and dejected.
C．People need not attempt to hide their depression because it's not a shameful thing.
D．Depression is hereditary.
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