下表中，对陈述I、Ⅱ的正确性及其有无因果关系的判断不正确的是[ ]

                      陈述Ⅰ                                           陈述Ⅱ                                                          判断

A．干冰升华时吸收大量的热                        干冰可用于人工降雨                                    Ⅰ对；Ⅱ对；有

B．硫酸在水溶液中能解离出H⁺          稀释时应将水慢慢倒入浓硫酸中并不断搅拌           Ⅰ对；Ⅱ错；无

C．铁丝生锈时消耗空气中的氧气                 铁粉可作除氧剂                                           Ⅰ对；Ⅱ对；有

D．活性炭能吸附Ca²⁺、Mg²⁺离子               活性炭可用于水的净化                                 Ⅰ对；Ⅱ对；有