@MichelleSilos I thought so too and it annoyed me a lot, but actually it will recommend you blind review any that you take a very long time on, or change your answer to multiple times, or answer so quickly that it seems like a guess. To tell why they're recommending you blind review, you should hover your mouse over the little information (i) symbol next to "blind review" and it will tell you why it is recommending that you review it. Hope this helps.

why is the negation for question four not: some large animals can move more rapidly than small animals. That feels like it follows from "it's not the case that small animals can move more rapidly than large animals".