1 . A persuasive advertisement should get across to the customers, which means the customers’ a________ (理解,吸收) of the ad is a successful factor.(根据中英文提示单词拼写)
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2 . The ________ (absorb) of vitamin D is essential for maintaining strong and healthy bones. (所给词的适当形式填空)
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3 . Noise control materials can be tested in terms of sound ________ (absorb). (所给词的适当形式填空)
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