Correct Answer: A

Rationale: In this context, moderation means consuming adequate amounts of unsaturated fats. The passage highlights that unsaturated fats like olive oil and omega-3 fatty acids are beneficial when consumed in appropriate quantities. Choice B, intervals of time, is incorrect as it does not relate to the consumption of fats. Choice C, excess, is incorrect because moderation implies avoiding excess consumption. Choice D, variation, is unrelated to the context of consuming fats in appropriate amounts.

Correct Answer: B

Rationale: In this context, "watchdog" refers to a guard or overseer, specifically relating to Lifewings Partners' mission of ensuring safety and preventing medical errors. The organization acts as a monitor in healthcare settings, which aligns with the definition of a watchdog, confirming that option B is correct.

Correct Answer: B

Rationale: The word "duration" in the context of sleep refers to the length of time that children should sleep. It suggests a focus on the amount of sleep necessary for healthy development, making option B the correct choice as it aligns with the emphasis on recommended sleep hours for children.

Correct Answer: A

Rationale: The statement that the connection between sleep and weight should be explored reflects a personal viewpoint rather than an objective fact. It indicates a belief that further research is warranted to understand this relationship better, making it an opinion and distinguishing it from the other factual statements presented in the passage.

Correct Answer: D

Rationale: The best title for this passage is 'PE for School and Life' as it encapsulates the broader purpose of physical education described in the extract. The passage emphasizes teaching students lifelong fitness habits, instilling lessons about maintaining good health, staying fit, and introducing exercise that can be incorporated into their lives. The focus is on fitness as a lifelong skill rather than just a short-term activity for a good grade. Choice A, 'Being a Team in PE,' is incorrect as the passage highlights individual exercise and movement rather than team-based activities. Choice B, 'A New Kind of Grade,' is also incorrect as the passage mentions a shift in grading towards effort rather than specific performance tasks. Choice C, 'Learning Martial Arts,' is too narrow as the passage discusses a variety of activities beyond martial arts that are taught in modern PE classes.