题目

请根据句子的意思或单词的首字母以适当形式完成下列句子，每空只填一个单词。61、He finished his work in a __________________ (积极的) way. 62、You should not r_____________ the invitation from your old friend. 63、Our class is d______________ into two groups during the discussion. 64、We are_____________(感到激动) to hear a wonderful piece of news that the people lived in the mainland can go to visit Taiwan in the near future. 65、We are______________(乐观的) that the mainland and Taiwan will unify in the near future. 66、The people in IpH=5的盐酸和pH=9的氢氧化钠溶液以体积比11∶9混合，混合液的pH为(　) A．7.2　　　　　B．8　　　　　　C．6　　　　　 D．无法计算