下列各项中，标点符号使用符合规范的一项是 (　　)

Many students in China are learning English. Some of these students are small children  Others are teenagers(青少年). Many are adults(成年人). Some learn at school, others study by themselves. A few learn English language over the radio, on television or in films. One must work hard to learn another language.
Why do all these people want to learn English? It is difficult to answer that question.  Many boys and girls learn English at school because it is one of their subjects. They study their own(自己的) language, Maths and English. Some people learn English because it is useful(有用的) for their work. Many people often learn English for their further studies, because at college or university(大学) some of their books are in English. Other people learn English because they want to read newspapers and magazines in English.

下列词语中加点字注音全都正确的一组是（　　）

2017年7月27日，全省各地12支中学代表队参加了首届青少年模拟政协。这些代表队利用暑假时间深入采访、收集调查问卷、访贤问计，展示了各具特色的提案，从网络暴力到城市盲道、电动自行车管理。各代表队不仅完成了自我展示，还参与了多场集体讨论，充分体验参政议政。中学生模拟政协活动的目的在于（    ）

①培养公民意识，提高青少年自身政治素养和政治参与能力

②获得实践体验，内化青少年对社会主义核心价值观的认同

③行使民主权利，增强青少年参与基层民主政治建设的能力

④拓宽民主渠道，激发青少年参与民主决策的热情与责任感

移植到人体内的器官不易成活，移植的器官相当于(    )