单项选择题

What does the word "assortment" (Line 5, Para. 2) probably mean

A．difference
B．separation
C．classification
D．mixture
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单项选择题
According to the passage, recycling is only possible when ______.
A．it is monitored by the government
B．different collection schemes operate
C．there is enough clean material
D．there is a small amount of clean material
单项选择题
It is implied in the passage that ______.
A．parents can never hope to teach their children new sounds
B．children no longer imitate people after they being to speak
C．even after they have learnt to speak children still enjoy imitating
D．children who are good at imitating learn new words more quickly
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