英语三级B级
单选题People ought to take physical examinations at regular intervals so as to know their own health.
参考答案：D进入在线模考
本题答案：D-A-B-C。ought to相当于情态动词，后面跟动词原形，意思是“应当”；physical examinations意思是“体检”，而非“体育锻炼”；at regular intervals固定短语，意为“定期”，regular是“规则、规律”的意思；know their own health意思是“了解自己的健康情况”，而不是“确保自己身体健康”，这样同前半句意思也是相呼应的，作体检并不能保证自己的身体健康，顶多只能知悉自己的健康情况。
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