我国《合同法》规定，从事公共运输的承运人不得拒绝旅客、托运人通常、合理的运输要求。我们将公共运输承运人承担的此种义务称为( )

A．承诺义务

B．强制义务

C．强制性承诺义务

D．诚实信用义务

More and more vehicles using cheap fuel, declared scientists at the conference, have left Bangkok’s children with body lead levels the world highest.

A．in the world highest

B．in the world’s highest
C．among the world’s highest

D．among the highest of world