What is the subject of the letter? ______(of) the new cleaner. What are the special advantages of the new type of vacuum clean

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问题 What is the subject of the letter?
______(of) the new cleaner.

What are the special advantages of the new type of vacuum cleaner?
It’s ______ and the working parts are interchangeable.

选项

答案energy saving

解析 本题问这款真空吸尘器的好处。见第二段第二句。
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