Pay-for-knowledgeplatformsandapps,includingWeiboandZhih...
问题详情：Pay-for-knowledgeplatformsandapps,includingWeiboandZhihu,①__________allowpeopletopaymoneytohavetheirquestionsansweredbyprofessionalsorseeonlineanswersprovidedtoothers,②__________(be)becoming...