607.The traditional approach _______ with complex problems in our studies is to break them down into smaller,more easily managed problems.
A.to deal
B.having dealt
C.to dealing
D.being dealt
608.Carbon dioxide ________ from burning fuels is the most common of the so-called greenhouse gases.
A.producing
B.having been produced
C.to be produced
D.produced
607.答案是C;an approach to dealing with a complex problem一个解决复杂问题的方法。注意:其中to为介词。
608.答案是D;此题中过去分词短语produced from burning fuels修饰carbon dioxide。
