【正确答案】 D

【答案解析】[解析] capability：能力，力量。如：Now we have the capability of defending our country，all thanks to our own efforts.The country has the capability-to defeat any aggressor.ability：能力，本领。From each according to his abilities,to each according to his work.ability和capability在意义上有相同的一面，因而在一定语境中可以互换。可以看出，ability和capability在搭配上是有差别的，前者只可跟to搭配，但后者既可跟to又可跟of搭配。二者的形容词分别是able和capable：I ought to be able to live on my salary.She was perfectly capable of taking care of herself.注意：capable只能跟of而不能跟to搭配。不难看出，词的意义不决定句法结构。strength：力量。优点。Their military strength has gone down because their air force has proved to bean effective force.此句中的strength可由capacity替代而不改变句子的意义。possibility：可能性。