I don't have the book in front of me, but the following will hopefully help:
dl49 wrote:Hi Dave,
Regarding the updated questions, I'm still confused about why #3 is Must X while #5 is Cannot X. Could you elaborate? I think I know the difference between the two question stem types: with Must X, the four incorrect answers must be true and the correct answer could be true or could be false. With Cannot X, the four incorrect answers cannot be true, while the correct answer could be true or must be true.
YES, you are exactly correct here
dl49 wrote:I've read the answer key and am confused about the explanation for #5: what does it mean that "rejecting an answer is a characteristic of Cannot Be True questions"?
There are different ways to think about Cannot questions, but one way is to think of these as Reverse Weaken questions. Instead of the answer choice being used to weaken the stimulus (as with Weaken), in a Cannot question the stimulus is used to weaken the answers. Thus, one could say that the information in the stimulus is being used to undermine or reject the answer.
Hopefully that helps—please let me know!