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My sister met him at the Grand Theatre yesterday aftemoon , so he _____ your lecture. [ ]
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Mr. Brown had got a __________ and he went to see a dentist.
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I’d like a bag of rice, for I have _______ at home.
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人耳能分清原声和回声的时间间隔应大于0.1秒,所以要能听到回声,人离障碍物的距离应( ) A. 大于34米 B. 大于17米 C. 等于34米 D. 等于17米
1年前