Which of the following statements is (are) true ( ) Ⅰ. The number of cyclic subgroups of the additive group of integers is infinite Ⅱ. The number of cyclic subgroups of the additive group of real numbers is infinite

A．Ⅰ and Ⅱ

B．Ⅰ only

C．Ⅱ only

D．neither Questions 43、44 refer to the space requirements of different methods of storing graph The Choices for these questions are combinations of the following statement Ⅰ. The space required depends on the number of vertices Ⅱ. The space required depends on the number of edges

在网络面前，人人都是新闻记者，人人都可以投身 * * 活动。一项调查显示，87.9％的网民非常关注网络监督；当遇到社会不良现象时，99.3％的网民会选择网络曝光。这一现象（   ）

①主要是由于网络舆论监督具有透明度高、威力大、影响广等特点

②表明自觉接受网民的监督是有权威政府的标志

③表明网络舆论在对国家机关及其工作人员的监督中发挥着独特作用

④表明政府接受网民监督是坚持依法行政的必要保证

A．①②

B．①④

C．①③

D．②③