单项选择题

A．They are built to produce more fruits and wheat.
B．They are naturally air-conditioning and water-saving houses.
C．Most of green houses are used only in winter for heating.
D．People try to save energy as much as possible.
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单项选择题
A．To limit the water taken by children.B．To wake up children for bathroom.C．To make children take sleep-induction pills.D．To make children stay up late into the night.
A．To limit the water taken by children.
B．To wake up children for bathroom.
C．To make children take sleep-induction pills.
D．To make children stay up late into the night.
单项选择题
A．Spring.B．Summer.C．Autumn.D．Winter.
A．Spring.
B．Summer.
C．Autumn.
D．Winter.
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