Copy and paste are two of my favorite word processing functions. Everybody likes copy/paste. Especially if you're writing a long report and you have to mention the same trends/discussion items over and over again.
However. You need to go back and vary the word choice. If you use very simple sentence construction, you'll sound dumb saying, "the highest level of gack is here. The highest level of super-gack is here. The highest level of "Gah! Radioactive gack!" is here.
If you decide to get fancy and say, "the results of the analyses of the environmental media indicate that the maximum detected concentration of gack is situated in this location", then for the love of God, vary your sentences. Or your reviewer may get irrationally angry about your word choice and treat your report... poorly.