If I say that dogs bark when they're cold and then ask a five year old why dogs bark, I'd expect something like, "when they're cold! and when they're angry! and when Amy [sister of this 5yo] steps on his tail, hahaha". Or whatever. Reality is not bound by what someone written or said few moments ago. If you want to test reading comprehension, you have to control for prior experience in the subject which might be (and probably often is) greater than test author's.
If I say that dogs bark when they're cold and then ask a five year old why dogs bark, I'd expect something like, "when they're cold! and when they're angry! and when Amy [sister of this 5yo] steps on his tail, hahaha". Or whatever. Reality is not bound by what someone written or said few moments ago. If you want to test reading comprehension, you have to control for prior experience in the subject which might be (and probably often is) greater than test author's.