题目

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。 Some time ago, a light passenger plane flew course(航线) and thus crashed in the mountains and the pilot (kill). The only passengers, a young woman and her two baby daughters, were unhurt. It was the middle of winter. Snow (lie) thick on the ground. The woman knew that the nearest village was kilometers away and she was not strong enough (carry) her baby daughters there. When it grew dark, she turned the suit-case into a bed, where the children, (cover) with all the clothes she could f下列说法中不正确的是A.新型无机非金属材料具有光学特性、生物功能、电学特性、耐高温、强度高等特点B.光导纤维作通讯材料有许多优点，但怕腐蚀，铺设也很不方便C.高温结构陶瓷比金属材料具有许多优点，如不怕氧化、密度小等优点D.光导纤维除用于通讯外，还可以用于医疗、信息处理等许多方面