正确答案: C

置换反应

题目：芯片是电脑、“智能”加点的核心部件，它是用高纯度硅制成的。下面是生产单质硅过程中的一个重要反应：SiO2 + 2C ==== Si +2CO↑，该反应的基本类型是

解析：C

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举一反三的答案和解析：

[单选题]24． If one bad tooth is taken out ,there will be a _________ in its place．

hole

解析：24.A【解析】从第二段第二句可知。

[单选题])7．—Was there a nice picture on the wall?—＿＿＿＿＿＿．

No，there wasn't

[单选题]27． Jack didn't like to ________ when he was a student．

do his homework

解析：27.B【解析】由第一段第三句可知。

[单选题]I have thousands of classes since I started school rune years ago． But only one (51) was the most important．It happened Iast term just after I had got a (52) result in an exam．l was sad and had lost my confidence．l decided to go to a class which can tell me how to be (53) ．

class

解析：51．B【解析】由第一段第一句话“…thousands of classes …”得知，only one class是对的．

[单选题]24． The sentence "Your answers are welcome． " means " ________ "．

You are welcome to discuss the questions with us

解析：24.A【解析】倒数第二段提出了两个问题，可见最后一段话是为了让读者参与讨论．