C)It is a problem that can be solved once it is recognized.

    D)It is an area we actually have little knowledge about。

    A1 Gore calls global warming an "inconvenient truth," as if merely recognizing it could put us on a path to a solution. But the real truth is that we don't know enough to relieve global warming, and - without major technological breakthroughs - we can't do much about it.

    答案：D. Al Gore说全球变暖是个被忽视的真相，好像意味着只要意识到这一事实就我们就能有解决办法 ......