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

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热门试题

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

Which of the following waste is best suited to recycling

A．Empty milk cartons.
B．Textiles.
C．Potato peelings.
D．Cabbage stalks.