单项选择题

The manager tried to wave aside these issues as ______ details that would be settled later.

A．alternate
B．trivial
C．versatile
D．preliminary
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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
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
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