单项选择题

A．Because it was difficult to collect.
B．Because it was difficult to get rid of.
C．Because it came in a variety of forms.
D．Because it tended to be absorbed by physical objects.
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单项选择题
A．Because they are locked inside the house.B．Because they suffer problems from being left alone.C．Because they watch too much television during the day.D．Because they have little chance to play with their peers.
A．Because they are locked inside the house.
B．Because they suffer problems from being left alone.
C．Because they watch too much television during the day.
D．Because they have little chance to play with their peers.
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