问题
判断题
水的pH值小于4时,水中的碳酸化合物只有游离CO2,没有其它碳酸盐
答案
参考答案:对
水的pH值小于4时,水中的碳酸化合物只有游离CO2,没有其它碳酸盐
参考答案:对
根据句意选择正确的词组填空,注意使用正确形式:(每个小题1分,共10分)
小题2: Before agriculture __________, people made their living by hunting wild animals. 小题3:All of the guests had arrived by 9 o’clock, but the host didn’t ___ until 15 minutes later. 小题4: The boy _____________________ becoming a pilot. 小题5:I should like to buy a house, modern, comfortable, and ________, in a quiet place. 小题6: The little boy _______________ the radio to see what was wrong with it. 小题7:My teacher has always ______help endangered species and now she has the chance. 小题8:The film ________________ on a real story happening in a mountain village. 小题9:I like picture books very much. __________________, I am also interested in novels. 小题10: He often __________________ what the teacher says and take notes in class. |