找出划线部分发音不同的选项。
⑴____ A. camping B angry C. famous D. than
⑵____ A. editor B. become C. secondary D. general
⑶____ A. hiking B. skiing C. diving D. smiling
⑷____ A. solve B. social C. knock D. competition
⑸____ A. unhappy B. future C. humour D. musical