I was going to keep going until I got less than 50% but when I had gotten through 3/4 of the sections with only one 50, I decided to finish the quiz. I didn't keep a running tab but I got a surprizing number of 90s. Admittedly, there were a lot of educated guesses and a fair number of wild guesses.
My one peeve is that a lot of questions of the form, "X causes Y," could be interpreted as either, "X
can cause Y," or, "
Only X can cause Y."
All in all, I was surprised at how well I did. I think I'll start my own oil company tomorrow.