Trapped by the police, the terrorists made their ______ attempt to explode the bomb that they carried.

A．brave

B．harmful

C．desperate

D．considerate

在水溶液中，若〔H⁺〕（）〔OH^－〕，则此水溶液叫做中性溶液；若〔H⁺〕（）〔OH^－〕，叫做酸性溶液；若〔H⁺〕（）〔OH^－〕，叫做碱性溶液。