单项选择题

Sarah's ancestors arrived here from France about two hundred years ago.

A．descendants
B．forefathers
C．relatives
D．grandfathers
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Plants will emit an increased amount of heat when they are in poor physical condition.
A． Right
B． Wrong
C． Not mentioned
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In order to apply pesticide spraying precisely, we can use infrared scanning to locate the problem area.
A． Right
B． Wrong
C． Not mentioned
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