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![Forthesafetyofallthepassengers，objectslikeguns，knivesor...]( "Forthesafetyofallthepassengers，objectslikeguns，knivesor...")
Forthesafetyofallthepassengers，objectslikeguns，knivesor...
问题详情：Forthesafetyofallthepassengers，objectslikeguns，knivesorfireworks becarriedontotrains，planesorcoaches．A.may B.needn't C.should...
