填空题

What caused the health problems to workers after the September eleventh attacks according to this passage

【参考答案】

A harmful mix of dust，smoke and chemicals in the ruins．
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Who suffer the breathing problems most according to the latest study
单项选择题
A．A fable is a short, true story that teaches us a lesson.B．A fable is a short, untrue story about animals.C．A fable is a short, untrue story with a moral.D．A fable is a short lesson about animals.
A．A fable is a short, true story that teaches us a lesson.
B．A fable is a short, untrue story about animals.
C．A fable is a short, untrue story with a moral.
D．A fable is a short lesson about animals.
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