单项选择题

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

A.a
B.an
C.an
D.a

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单项选择题The word 'intent' in line 15 is closest in meaning to

It can be inferred that the 'safety valve' in line 13 refers toA.a new kind of machineryB.an alternative for urban workersC.an area in a factoryD.a procedure designed to protect workers