800 câu trắc nghiệm Điền từ Tiếng Anh có đáp án - Phần 21

Noise effects can be (5)_____ by a number of techniques, for example, increasing the distance or blocking the path between the noise source and the recipient, reducing noise level at the sour

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Noise effects can be (5)_____ by a number of techniques, for example, increasing the distance or blocking the path between the noise source and the recipient, reducing noise level at the source, and protecting recipients with earplugs or earmuffs

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Giải thích

A là đáp án đúng