单项选择题

Green products tend to be more expensive because the _________ may cost more than the conventional ones.
A、ingredients
B、delivery
C、packaging
D、promotion

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不定项选择

MapReduce系统中如：节点故障、网络不通的问题都可以由系统自动管理。

A．错误
B．正确

单项选择题

I ate a(n) ________ prepared sandwich and shot out the door.
A、 urgently
B、 immediately
C、 instantly
D、hastily