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

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

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问题 It’s disturbing to note how many of 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，人们无意中就发现了很多犯罪事件，还没有采用系统检查或其他安全规程。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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