题目

工业上制取大量氧气的方法是（   ） A . 分离液态空气 B . 加热高锰酸钾 C . 加热氯酸钾 D . 加热氯酸钾和二氧化锰的混合物 答案：A写出括号内所给词的正确形式1.His parents are both doctors, My parents are both teachers, what about ________(you)?2.Her ________ (old) sister often goes to the company by bus.3. His ideas are always _________ (help) to us .4.Do you still remember those two_________(company) names ?