【单选题】Last year the (4th----5th) winter Olympics were held in Sweden.
【单选题】恒容下某复杂反应(取单位体积)的反应机理为: ,分别以A和B反应物的浓度变化来计算反应速率,其中完全正确的一组是:()
【单选题】The last half of the 19th century ______ the steady improvement in the means of travel.
【简答题】On October 19th last year, prices on the New York stock exchange suffered their ______.
【单选题】Baseball fans celebrated the (18th----80th) anniversary of baseball last year.