脱贫攻坚战取得了全面胜利,脱贫地区农村居民人均可支配收入,从2013年的6070多元增长到2020年的12500多元.将12500用科学记数法表示为( ) A . B . C . D . 答案:AThe joke told by Tom made us________, so our maths teacher couldn’t make himself ________. A. laugh; hearing B. laugh; heard C. laughing; hear D. laughed; to be heard