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请在第（48）处填上最佳答案。参考答案：
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单选题：请在第（48）处填上最佳答案。
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构成计算机的电子的、机械的物理实体被称为（ ）。
构成计算机的电子的、机械的物理实体被称为（ ）。A．主机 B．外设 考试大_在线考试中心 C．计算机系统 D．计算机硬件系统
I didn't help him. I would have, however, I didn't have the
I didn't help him. I would have, however, I didn't have the money.
As they move, glaciers push piles of rocks ahead of them.
As they move, glaciers push piles of rocks ahead of them.A．A toward B．B above C．
请在（57）处填上最佳答案。
请在（57）处填上最佳答案。A．cloth B．paper C．plastic D．synthetic
根据以下材料，回答题。请在（51）处填上最佳答案。A．for B．to C．about D．with
根据以下材料，回答题。请在（51）处填上最佳答案。A．for B．to C．about D．with