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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大学英语三级B级

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