题目

In the past five years. I___ English words. A. have learned three thousand B. learned three thousand of C. had learned three thousands D. learned thousands of 答案：A下列材料分类不正确的是A．氮化硼陶瓷——有机高分子 B．储氢材料镧镍合金——金属材料C．机动车轮胎——复合材料 D．普通玻璃——无机非金属材料