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 second paragraph, a baby's first noises are ______.
A．a sign that he means to tell you something
B．a reflection of his moods and feelings
C．an imitation of the speaking of adults
D．an early form of language
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
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