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_________ (游泳) for some time after a tiring day is very enjoyable and exciting for me in summer.
1年前
They didn't provide __________ for Mr. Brown, so he had to find a hotel to live in.
1年前
The water is too deep. I couldn't see its bottom. (用hardly改为同义句 )
1年前
某同学在向氢氧化钠溶液中滴加稀盐酸研究中和反应时,忘了滴加酸碱指示剂。为了确认滴加的盐酸是否已经过量,从烧杯中取少量反应后的溶液于试管中,用某种试剂进行检验。
1年前
1年前