单项选择题

A. The book is about funny pictures.
B. The book is about interesting stories.
C. The book is about how to build a house.
D. The book is about buildings all over the world.
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单项选择题
What can you learn from the first two paragraphs
A. All active isolators are technically complex.
B. Consumers are more likely to choose active isolators.
C. Passive isolation isn’t as effective as the active one.
D. Consumers prefer those low-priced passive isolators.
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