Correct Answer: B

Rationale: The correct use of 'affect' is to show influence or make a difference. In this context, 'The noise did not affect his sleep' is the correct usage as noise can impact one's ability to sleep. Choice A is incorrect as 'affect' is commonly confused with 'effect.' Choice C is incorrect as 'affect' is not typically used to refer to the impact of light on eyes. Choice D is incorrect as 'affect' is not typically used to describe the impact of weather on mood.

Correct Answer: B

Rationale: The correct answer is B: 'Reddened or ruddy appearance.' When someone is flushed, it means they have a red or ruddy complexion, often due to embarrassment, anger, or a physical reaction. Choices A, C, and D are incorrect because 'flushed' specifically refers to a red or ruddy appearance, not swelling, discoloration, or paleness.

Correct Answer: D

Rationale: The correct answer is D, 'effect.' The verb 'effect' is defined as to bring about, cause to happen, accomplish, or make. It describes the action of making something happen or producing a result. Choices A, B, and C are incorrect because 'affect' means to influence, 'accept' means to receive willingly, and 'expect' means to anticipate. Therefore, the correct choice is D, 'effect.'

Correct Answer: B

Rationale: The correct answer is B: 'Outdated.' When something is described as 'obsolete,' it means that it is outdated or no longer in use. Therefore, an obsolete theory is no longer current or relevant. Choices A, C, and D are incorrect because an obsolete theory is not considered up to date, innovative, or necessarily scientific; it is outdated and no longer relevant in its field.

Correct Answer: B

Rationale: The correct definition of bilateral is something that is present on two sides. This term is commonly used in medical contexts to describe conditions or procedures that affect or involve both sides of a particular part of the body. Choice A, 'Occurring on one side,' is incorrect because bilateral refers to both sides, not just one. Choice C, 'Occurring in random areas,' is incorrect as bilateral specifically means on two sides, not random areas. Choice D, 'Not occurring,' is also incorrect as bilateral refers to something present on two sides, not the absence of occurrence.