OFFICIAL EXPLANATION


A, F, H

Let's start with the second blank. The key phrase "actually disruptive" suggests that the second missing word will reflect a negative effect that tourists are having on the native population. Choice (F) deleterious, or "harmful," fits this prediction and is correct. Choice (D) beneficial, or "helpful," is the opposite of the meaning we seek. Choice (E) cumulative, meaning "increasing over time," is appealing in that the effect can be compounded with repeated visits, but the choice does not convey the negative meaning indicated by "disruptive."
Proceeding to the third blank, we are looking for a word that summarizes an aspect of the native community that is being negatively affected by tourism. Since there are no specific clues about what the tourists are negatively affecting, we need a general word like "livelihood." Choice (H) welfare, or "state of well-being," is definitely an aspect of native life that could be negatively affected by disruptive tourists, so this is the correct answer. Choice (G) economy relates to one aspect of the native community, but there are no clues to indicate how the economy would be affected-positively or negatively. Therefore, choice (G) is incorrect. Choice (I) aesthetics, or "beliefs about the nature of beauty," is wrong for the same reason. Without specific clues to guide us, we cannot conclude that such beliefs would be affected by the intrusion of tourists.
Going back to the first blank, the detour road sign "although" lets us know that the tour guide's motives contrast with the negative effect the tourists are having on the native population. We can predict a word with positive connotations such as "noble." Choice (A) admirable, or "commendable," fulfills this expectation and is correct. Choice (B) ulterior, meaning "hidden," is often used to describe motives that are negative, so this choice is incorrect. Choice (C) unethical, or "morally bad," is also negative, so this choice is incorrect as well.

The correct answer choices are (A), (F), and (H).