Correct Answer: C

Rationale: Hypothetical is best defined as being assumed because it describes something that is based on a theory or assumption rather than solid proof or certainty. Hypothetical situations are used to explore different possibilities or outcomes without being confirmed as true or existing. Choice A, 'rigorous,' does not accurately define hypothetical, as it refers to something that is extremely thorough, accurate, or carefully done. Choice B, 'short-term,' is unrelated to the definition of hypothetical. Choice D, 'convinced,' does not capture the essence of hypothetical, which is more about assumptions and possibilities rather than being convinced of something.

Correct Answer: D

Rationale: The abbreviation CDC stands for the Centers for Disease Control and Prevention, which is a well-known public health association in the United States. The CDC is a federal agency under the Department of Health and Human Services, responsible for protecting public health and safety by controlling and preventing disease, injury, and disability. Choices A, B, and C are incorrect as they do not accurately describe what the CDC is known for; it is not an online social network, a test for postgraduate students, or a pharmaceutical company.

Correct Answer: A

Rationale: The correct answer is A: 'relieve it.' To alleviate a symptom means to reduce or improve it, thus providing relief or easing of the discomfort or issue being experienced. Choice B, 'diagnose it,' is incorrect as diagnosing a symptom involves identifying or determining its cause, not relieving it. Choice C, 'suffer from it,' is incorrect as it refers to experiencing the symptom, not alleviating it. Choice D, 'manage it,' is incorrect as managing a symptom involves controlling or handling it, not necessarily reducing or relieving it.

Correct Answer: C

Rationale: The best description for an assembled product in the given sentence is "a product that is put together," as assembling refers to the action of putting together various parts or components to create a finished product. The sentence mentions that the provisions apply to any "assembled product" along with components, parts, or accessories of the product. Choice A, 'A product that is collected,' is incorrect as collecting does not imply assembling. Choice B, 'A product that is legislated,' is incorrect as legislation is related to laws and regulations, not the physical process of assembling. Choice D, 'A product that is agreed upon,' is incorrect as agreeing upon a product is unrelated to the physical act of assembling it.

Correct Answer: C

Rationale: In the context of the sentence, the word 'placebo' refers to a substance or treatment that resembles a real medical treatment but has no therapeutic effect. It is used as a standard against which the effects of the experimental drug are compared. A placebo is typically included in a control group in medical research to evaluate the actual effects of the experimental drug. Therefore, in this scenario, the placebo serves as a control to gauge the effectiveness of the experimental drug, making choice C the correct answer. Choices A, B, and D are incorrect because a placebo is not a fallback, substitute, or curative treatment in this context.