試卷：無年度 - 2002年5月托福閱讀#20903
| 科目：TOEFL(Test of English as a Foreign Language)托福
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試卷名稱：無年度 - 2002年5月托福閱讀#20903
科目：TOEFL(Test of English as a Foreign Language)托福
44. It can be inferred that the "safety valve" in line 13 refers to
(A) a new kind of machinery
(B) an alternative for urban workers
(C) an area in a factory
(D) a procedure designed to protect workers
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