Choose the word closest in meaning to 'secure' as used in the sentence: The company installed advanced systems to ______ its data from cyberattacks.
答案解析
**Core Topic**: Vocabulary (synonym recognition). **Key Clue**: 'Secure' here means 'to protect'. **Analysis**: A. 'protect' directly matches the context of safeguarding data. B. 'ensure' implies certainty but not defense. C. 'fix' refers to repair, not security. D. 'confirm' means to verify. **Common Mistake**: Confusing 'ensure' (guarantee) with physical protection.
正确答案：A