47. What contributed to problems of the workers in World Trade Center after the attacks?
48. Who had the most serious breathing problems according to the latest study?
49. The researchers decided to carry on some study on the effects on breathing first because __________ might appear in a later period of time.
50. ______ are sharply criticized by some lawmakers because they let workers labor at Ground Zero with out satisfactory equipment.
51. What measures have the officials promised to take to deal with the health problem?
答案47. A harmful mix of dust,smoke and chemicals in the ruins.
48. The building trades,firefighters,police officers and other workers. 49. other disorders
50. City and state officials 51. To pay more than fifty million dollars for treatment of the workers.
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