单项选择题

Dr. Jones ordered ______ for the laboratory.

A．two pieces of equipments
B．two equipments
C．two pieces of equipment
D．two piece equipments
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单项选择题
His unhappy childhood ______ his bad temper.
A．counts for
B．accounts for
C．makes for
D．goes for
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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