Cyber technology is among the few core technologies whose edges must be sharpened domestically to maintain social stability and______ the national interests.
【正确答案】 A
【答案解析】解析：safeguard“保护，捍卫”；prevent“防止，预防”；protest“抗议，主张”；save“解救，保存，保全”。根据题意，本题选A。