题目

室温下，0.1 mol·L－1的硫化钠溶液和0.1 mol·L－1的碳酸钠溶液，碱性更强的是__________，其原因是___________________________________________________。 已知：H2S：Ki1＝1.3×10－7 Ki2＝7.1×10－15 H2CO3：Ki1＝4.3×10－7 Ki2＝5.6×10－11 答案：答案 硫化钠溶液 硫化氢的Ki2小于碳酸的Ki2，硫化钠更易水解Many students have already had clear ideas about what jobs they would like to have in the future. We believe boys’ choices (选择) are different from girls’. To find out how different their choices are, we made a survey in Green High School. The following diagram shows the results of the survey. Bank       Reporter    Manager     Scientist     Teacher clerk【小题1】.About 45% of the girls would like to be ________ in the future.A．bank clerksB．reportersC．scientistsD．teachers【小题2】Which job do the boys like best?A．Bank clerksB．ReportersC．ManagersD．Scientists【小题3】Which of the following statements is TRUE?A．More girls would like to be reporters than boys.B．More boys would like to be bank clerks than girls.C．Boys would like to be reporters most.D．Girls would like to be managers most.