题目

Which country is going to ________ the next World Cup? A．happen                               B．struggle C．exchange                             D．host 答案：解析：句意：哪个国家将主办下一届世界杯？host意为“主办”，符合句意。 答案：D在△ABC中，B=30°，BC=4，AC=3，cosA=________．