2. 外语
  3. What kind of letter is it? It’s a letter of ______. What was the first problem he had? The ______ didn’t work well.

What kind of letter is it? It’s a letter of ______. What was the first problem he had? The ______ didn’t work well.

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问题 What kind of letter is it?
   It’s a letter of ______.

What was the first problem he had?
   The ______ didn’t work well.
选项
答案tracking mechanism
解析 根据文章中第三段第一话中的“For one thing, the tracking (跟踪) mechanism doesn’t work properly即可作答”。
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