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: B

Rationale: In the context of the sentence, 'affected' is used to describe the area that requires the application of cream. It refers to a part of the body that is diseased or suffering from some ailment. Therefore, the correct meaning of 'affected' in this context is 'Diseased.' Choice A, 'Involved,' does not accurately capture the medical context of the sentence. Choice C, 'Assumed,' is not relevant to the physical condition described in the sentence. Choice D, 'Perceived,' does not convey the idea of a physical ailment, making it incorrect. The most appropriate interpretation is 'Diseased,' as it aligns with the context of applying cream to a specific area due to a health issue.

Correct Answer: B

Rationale: The word 'intramuscularly' in the sentence indicates that the vaccine should be used by injection directly into the muscles. This means the correct meaning is 'into muscles,' making option B the most suitable choice. Choices A, C, and D are incorrect because 'intramuscularly' specifically refers to administering something inside the muscle, not between muscles, without muscles, or on top of muscles.

Correct Answer: B

Rationale: The correct answer is B. parietal. The parietal bone is one of the eight bones that form the human skull. It is located near the top of the skull and forms the sides and roof of the cranium. The parietal bones come together at the top of the skull in a structure called the sagittal suture. Choices A, C, and D are incorrect as they do not refer to any cranial bone. 'Partial' means incomplete, 'pariah' refers to an outcast or social reject, and 'parhelion' is a bright spot appearing on either side of the sun.

Correct Answer: D

Rationale: Unruffled means calm and not agitated. The word 'composed' also means calm and collected, making it the correct synonym in this context. 'Concerned' (choice A) means worried or anxious, 'wholesome' (choice B) means promoting health and well-being, and 'tedious' (choice C) means boring or monotonous, making them all incorrect choices.