题目

—I heard you wanted to have a further study in a foreign college.—Yes, that's _____I try my best to learn English well. A . when B . how C . what D . why 答案：D 建筑工地运来5车水泥，每车装80袋，一共运来20000千克，每袋水泥重 [    ] A．500千克 B．250千克 C．4000千克 D．50千克