单项选择题

Once the baby has mastered the idea that space is three-dimensional, it ______ out and begins grasping various kinds of objects.

A．shouts
B．reaches
C．aims
D．pull
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单项选择题
The United States court system is characterized by ______ hierarchies: there are both state and federal courts.
A．double
B．complex
C．simplex
D．dual
单项选择题
My father did not go to New York; the doctor suggested that he ______ there.
A．not to go
B．not go
C．hadn't gone
D．wouldn't go
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