2. 外语
  3. It is disturbing to note how many crimes we do know about were detected______, not by systematic inspections or other security p

It is disturbing to note how many crimes we do know about were detected______, not by systematic inspections or other security p

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问题 It is disturbing to note how many crimes we do know about were detected______, not by systematic inspections or other security procedures.
选项 A、by accident
B、on schedule
C、in general
D、at intervals
答案A
解析 句子大意为：令人烦恼的是，我们知道的很多犯罪案件都是无意中发现的，而非通过系统的检查或其他安全措施。在给出的选项中：by accident“偶然地、意外地”；on schedule“按时”；in general“总体上”；at intervals“间歇”。所以，正确答案是A。
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