【简答题】around / down / for / in / out / up The sales staff invited us for dinner, but we had to turn __________ the invitation, as our plane was leaving at 7 p.m.
【判断题】The dinner sales up to the peak.
【简答题】____ españoles cenan muy tarde.
【单选题】根据诱导效应推测下列羧酸中酸性最强的是:乙酸(CH3COOH)、氯乙酸(CClH2COOH)、二氯乙酸(CCl2HCOOH)、三氯乙酸(CCl3COOH)
【简答题】commercial documents