Correct Answer: B

Rationale: The correct answer is B. The passage explains that the kingsnake mimics the venomous coral snake's markings to deter predators, particularly hawks and eagles, which cannot differentiate between the two species. This implies that both the coral snake and the kingsnake face similar threats from predators in their shared habitat. Choice A is incorrect because the passage clearly states that the kingsnake is nonvenomous, so it is not dangerous to humans. Choice C is incorrect as the passage highlights that not all snakes with flashy markings are venomous, emphasizing the need for caution. Choice D is incorrect as there is no mention of the kingsnake changing its markings in response to the presence of hawks or eagles in the passage.

Correct Answer: B

Rationale: The correct answer is B. The author's primary purpose in writing this essay is to teach readers the difference between coral snakes and kingsnakes. The essay discusses how skin coloration and markings help snakes hide from predators and indicate whether a snake is venomous. By comparing the physical characteristics and behaviors of coral snakes and kingsnakes, the author helps readers understand how to distinguish between the two species to avoid potential dangers. Choice A is incorrect because the essay focuses more on distinguishing between snake species rather than solely on the relationship between markings and venom. Choice C is incorrect as the essay does not aim to illustrate why snakes are dangerous but rather to educate about the differences between specific snake types. Choice D is incorrect as the essay does not discuss how animals survive in difficult environments, but instead focuses on snake markings and behaviors.

Correct Answer: D

Rationale: In the context provided, the word 'testament' most likely refers to evidence. A testament can be something that serves as proof or confirmation of a fact or situation. In this case, it is used in a non-religious sense to indicate evidence or proof. The other choices are incorrect as 'story' does not fit the context, 'surprise' is not related to the owners' skills mentioned, and 'artifact' does not align with the discussion of the restaurant's success.

Correct Answer: A

Rationale: Choice A weakens the author's argument by highlighting a potential conflict of interest. If the cited study was funded by a company offering discounted tutoring, it could introduce bias and question the credibility of the study's findings. This revelation could cast doubt on the objectivity and reliability of the research, ultimately undermining the argument based on the cited study. Choices B, C, and D do not directly impact the credibility or objectivity of the cited study, so they would not significantly weaken the author's argument.

Correct Answer: D

Rationale: The author's conclusion about the house on Pine Street is that it was too expensive. This can be inferred from the description provided in the text, where it is mentioned that although the house had enough space inside, it didn't have a big enough yard for their dogs, and the cost of the house was well above their price range. Therefore, the correct answer is D. Choices A, B, and C are incorrect as they do not align with the evidence from the text, which clearly points to the cost being the main issue with the house on Pine Street.