Theword“inexorable”inParagraph1means____.（） A: inevitable B: incidental C: inconvenient D: inadequate

At the Pentagon and at NATO headquarters, officials still see air power as an ______ force. A: inescapable B: inexcusable C: inexorable D: inexplicable

Of all the changes that have taken place in English-language newspapers during the past quarter-century, perhaps the most far-reaching has been the inexorable decline in the scope and seriousness of their arts coverage.该句属于哪种句子结构类型：