题目

下图是一个材料弯曲测试示意图，通过逐一增加钩码质量，观测材料弯曲的程度；你认为这一试验属于：（） A . 性能试验 B . 优化试验 C . 信息试验 D . 预测试验 答案：A听独白，回答下列各小题。【1】Sam went to the city park at last Sunday afternoon.A.2:00B.3:00C.4:00【2】The dog’s was hurt.A.noseB.legC.head【3】Sam didn’t keep the dog because _.A.his mother worried it would hurt his sisterB.his sister was afraid of itC.his house was too small【4】The dog stayed at Sam’s home for .A.six monthsB.two weeksC.five days【5】Sam is a(n) person according to the passage.A.funnyB.kindC.honest