单项选择题

A．The kilogram.
B．The energy content.
C．Heat energy of water.
D．The calorie.
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单项选择题
A．Because they do not have any motivation to work.B．Because they are not very self-confident.C．Because they are too young or too old to work.D．Because they have physical and family problems.
A．Because they do not have any motivation to work.
B．Because they are not very self-confident.
C．Because they are too young or too old to work.
D．Because they have physical and family problems.
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