题型:单项选择题 自然铜的形状特征是A.呈椭圆形,表面灰褐色,有金属光泽B.呈方块形,表面红褐色,有钉头状乳起C.呈不规则形,表面铜黄色,有 * * 状突起D.呈方块形,表面亮黄色或棕褐色,有金属光泽E.呈方块形,表面淡绿色,有蜡样光泽 查看答案
题型:选择题 —Is your clock on the desk? —__________.[ ]A. Yes,I am B. Yes,it is C. Yes, it isn't D.No,I can't 查看答案