Section A
1. When did scientist invent the first robot ?
invent(动词)发明；inventor（名词）发明家；invention(名词)发明 如：Edison was a great inventor. He invented many inventions.
2. But before that, something like a robot appeared.
appear 出现； disappear 消失 The girl disappeared in the forest.
3. Robots can take the place of humans to do hard or boring work in some situations.
(1) take the place of… = take one’s place 代替… (动词短语，可放主语后做谓语)
如： He took the place of me to answer the question.
(2) instead of 代替（介词短语，不能作谓语，应放在谓语动词后）如： He answer the question instead of me. 4. Are you sure?
(1) be sure of / about sth. 确信… He is sure of his success.
(2) be sure to do sth. 一定会做某事：It is sure to rain.
(3) be sure +that从句 I’m sure that he will come.
5. repair和mend 都有“修理，修补”的含义，但mend 一般用于修理小东西、简单东西，如门窗、鞋袜、道路等。而repair 用于修理复杂、精密的东西，如：机器，手表，车辆等。
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