单项选择题


A．flexibility
B．distinctions
C．variations
D．alterations
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单项选择题
What does the word assortment (Line 5, Para. 2) probably mean
A．difference
B．separation
C．classification
D．mixture
单项选择题
Which of the following waste is best suited to recycling
A．Empty milk cartons.
B．Textiles.
C．Potato peelings.
D．Cabbage stalks.
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