【題目】The dog has a(n) _______ sense of smell while the rabbit has a sharp sense of hearing.

A. acute B. cautious

C. flexible D. valid

【答案】A

【解析】

試題分析：考查形容詞辨析；A. acute ;敏銳的，敏感的; B. cautious小心的，謹(jǐn)慎的；C. flexible靈活的，柔韌的； D. valid正當(dāng)?shù)�，健全的；句意：狗狗有著靈敏的嗅覺，而兔子有敏銳的聽覺。故選A

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