单项选择题

A．To limit discussion on heating bills.
B．To determine temperature in homes.
C．To prevent heat loss.
D．To convert homes to electric heat.
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单项选择题
A．They find it easy to communicate.B．They look for exact information.C．They want to learn from the people who speak the language.D．They want to teach the language to others.
A．They find it easy to communicate.
B．They look for exact information.
C．They want to learn from the people who speak the language.
D．They want to teach the language to others.
填空题
During which period was China the sole exporter of tea to Britain
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