单项选择题

A．50%.
B．20%.
C．30%.
D．All of it.
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单项选择题
A．The science block.B．The library.C．The maths block.D．The west block.
A．The science block.
B．The library.
C．The maths block.
D．The west block.
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 number 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 number 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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