2. 外语
  3. The purpose in writing this text is ______. Before dropping rubbish into the chute you have to ______.

The purpose in writing this text is ______. Before dropping rubbish into the chute you have to ______.

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问题 The purpose in writing this text is ______.
Before dropping rubbish into the chute you have to ______.
选项 A、lock the other floors’ chute doors
B、check if the container is full
C、press the correct button
D、break up the rubbish
答案C
解析 根据At the press of a button，a microcomputer locks all other floor’s chute doors可推断。
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