单项选择题

A．Patient and doctor.
B．Waitress and customer.
C．Wife and husband.
D．Secretary and boss.
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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.
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.
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.
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