单项选择题
It can be inferred from the passage that all the work on the assembly line was ______.
A．dangerous and dull
B．harmful but beneficial
C．repetitive and dull
D．easy but tiring
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单项选择题
In the sunlight, the coolest clothes would be ______.
A．yellow
B．black
C．green
D．white
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单项选择题
Which statement is true according to the passage
A．Not all objects reflect light.
B．All objects reflect light.
C．One particular object reflects only one color of light.
D．No objects will reflect all colors of light.
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