单项选择题
（）umbrellas are commonly used to protect（）people from（）rain.
A．/...the...the
B．The...the.../
C．/.../.../
D．The.../...the
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If laid out in（）straight line,（）human digestive tract would measure approximately thirty-foot long.
A．a...the
B．/...the
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（）most common kind of fuel used by（）peasants in our district is wood.
A．/...the...the
B．/...the.../
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Since（）beginning of photography,（）inventors have tried to make（）photographs that duplicate（）natural colors.
A．the.../.../.../
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D．/...the...the.../
