单项选择题

A．Living conditions.
B．Sunshine and fresh air.
C．Air-conditioned houses.
D．A few flowers and a few leaves.
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单项选择题
A．Shop assistant and customer.B．Post clerk and customer.C．Store keeper and customer.D．Waitress and customer.
A．Shop assistant and customer.
B．Post clerk and customer.
C．Store keeper and customer.
D．Waitress and customer.
单项选择题
A．Because there planes fly higher than at the equator.B．Because there the eyes can reach about 4,000 metres.C．Because there planes are clear of bad weather.D．Because there planes fly more quickly than at the equator.
A．Because there planes fly higher than at the equator.
B．Because there the eyes can reach about 4,000 metres.
C．Because there planes are clear of bad weather.
D．Because there planes fly more quickly than at the equator.
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