800 câu trắc nghiệm Điền từ Tiếng Anh có đáp án - Phần 9

But it may be harder than the battle against the trade in ivory, for there is a (5)___________between the two commodities. Ivory is a luxury; rhino horn, people believe, could save the life o

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But it may be harder than the battle against the trade in ivory, for there is a (5)___________between the two commodities. Ivory is a luxury; rhino horn, people believe, could save the life of their child

variation

comparison

variety

difference

Giải thích

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