单项选择题

According to the man, what sort of safety feature is used on the filters7

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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单项选择题

Mohammed Abu Shamallah was sentenced to life in prison for______.

A．his involvement in the protesting at a death sentence handed down against Attar
B．his slaying a Palestinian policeman and being a double agent
C．his opening fire on rioters protesting at a death sentence handed down against Attar
D．his involvement in the shooting of a Palestinian policeman

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According to the man, what sort of safety feature is used on the filters7 您的浏览器不支持 audio 元素。

According to the man, what sort of safety feature is used on the filters7