题目

 China’s youths topped a list of calculating abilities, but ranked last on      imagination and 5th from         _____bottom for creativity, according to an education survey of 21 countries and regions. A. the; the                    B. an; the                       C. /; /                         D. /; the 答案：D20．三角形的面积是15平方厘米，底3厘米，高是10厘米．