单项选择题

A．half a year.
B．half a circle.
C．a bicycle.
D．quarter of a circle.
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单项选择题
A．work the same number of hours; same education, age and union status; live in different regions of the country.B．live in the same region of the country; same age and union status; work same num her of hours.C．worked for the government; lived in the same region of the country; education; same age; union status and education.D．work the same number of hours; same age, union status and education; lived in the same region of the country.
A．work the same number of hours; same education, age and union status; live in different regions of the country.
B．live in the same region of the country; same age and union status; work same num her of hours.
C．worked for the government; lived in the same region of the country; education; same age; union status and education.
D．work the same number of hours; same age, union status and education; lived in the same region of the country.
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