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单选题
根据下面资料，回答1-5题
  What exactly is a robot? There are some important characteristics that a robot must have. These characteristics might help you to decide what is and what is not a robot. They will also help you to decide what you will need to build into a machine before it can be considered as a robot. A robot has the following important characteristics.   Your robot would have to be able to sense the environment around it. Give your robot sensors (传感器) : light sensors (eyes) , touch sensors (hands) , chemical sensors (nose) , hearing sensors (ears) and taste sensors (tongue).   A robot needs to be able to move around its environment. It can move on wheels, walk on legs or be driven by small engines. A robot can move either the whole body or just parts of it.   A robot needs to be able to power itself up. Some robots might power themselves up with sunlight, some might with electricity, while others with the battery. The way your robot gets its energy will depend on what your robot needs to do.   A robot needs some kind of “smarts”. A programmer is the person who gives the robot its “smarts”. The robot will have to have a certain way to receive the program so that it knows what to do.

The underlined word “it” in Paragraph 1 refers to ________.

A
the toy
B
the characteristic
C
the machine
D
the engine
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答案：

C

解析：

【全文翻译】
机器人到底是什么呢?有一些重要特征是机器人必须拥有的。这些特征可能会帮助你决定什么是机器人、 什么不是机器人。它们还将帮助你决定你需要把什么加到一个机器的构建之中，使这个机器可以被视为机器人。机器人有以下重要特征。
你的机器人必须能感知它周围的环境。赋予你的机器人传感器：光传感器(眼睛)、触觉传感器(手)、化学传感器(鼻子)、听觉传感器(耳朵)和味觉传感器(舌头)。
机器人需要能在它周围的环境里移动。它可以通过轮子移动，用腿行走或由小型发动机驱动，机器人可以移动整个身体，也可以只移动一部分(身体)。
机器人需要能给自己充电。一些机器人可以通过阳光给自己充电，还有一些可以通过电能(给自己充电)，而其他的可以通过电池(给自己充电)。你的机器人获取能量的方式将取决于你的机器人需要做的工作。
机器人需要某种“智慧”。程序员是给予机器人“智慧”的人。机器人将必须有特定的方式来接收程序，这样它才知道自己要做什么。
【答题思路】
根据第一段倒数第二句“They will also help you to decide what you will need to build into a machine before it can be considered as a robot.”可知，它们还可以帮助您决定需要将什么内置到机器中才能使此机器被视为机器人。由此可推知，此处it指代的是前面的machine。故选C。
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