单项选择题

A．Because they bent over from the waist.
B．Because they bent their knees and squat down.
C．Because they keep their back and hips in a straight line.
D．Because they used the muscles in the lower back.
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单项选择题
A．He went to a famous school.B．He was taught by his mother.C．His parents employed a good teacher to teach him.D．He was taught by his father.
A．He went to a famous school.
B．He was taught by his mother.
C．His parents employed a good teacher to teach him.
D．He was taught by his father.
单项选择题
A．A guide.B．A waiter.C．A porter.D．A cook.
A．A guide.
B．A waiter.
C．A porter.
D．A cook.
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