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 ff 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 floors’ chute doors”可推断。

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