单项选择题
A．signsB．marksC．layersD．spotsYou can tell from the yell……
You can tell from the yellow
streaks
on the leaves that the plant has been infected.
A．signs
B．marks
C．layers
D．spots
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单项选择题
This remarkable technology provides far greater clarity than conventional x-ray.
A．accuracy
B．precision
C．degree
D．correctness
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