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【参考答案】

In recent years, as job problems became serious, some people......

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填空题
将which省略掉。
单项选择题
A．They become clogged before losing effectiveness.B．They’re equipped with built-in measuring devices.C．Their safety, limits are clearly marked.D．They change color when no longer effective.
A．They become clogged before losing effectiveness.
B．They’re equipped with built-in measuring devices.
C．Their safety, limits are clearly marked.
D．They change color when no longer effective.
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