单项选择题

He is a ________and well-behaved child, but his parents worry about him for he talks too little.

A．obedient
B．transient
C．conscious
D．passionate
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单项选择题
The young woman' s parents ________her for questioning their authority.
A．scorned
B．scolded
C．scrubbed
D．scored
单项选择题
Why does the author mention genetic engineering and computer science
A．To compare them with the new materials.
B．To show the significance of the new materials on the future world.
C．To compare the new materials to them.
D．To explain his viewpoint.
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