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.
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单项选择题
A．She was invited only for the weekend.B．The weather was too hot.C．She had an appointment.D．She had schoolwork to do.
A．She was invited only for the weekend.
B．The weather was too hot.
C．She had an appointment.
D．She had schoolwork to do.
单项选择题
A．In a fast-food restaurant.B．At a shopping center.C．At a county fair.D．In a bakery.
A．In a fast-food restaurant.
B．At a shopping center.
C．At a county fair.
D．In a bakery.
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