Correct Answer: D

Rationale: The correct statement about the passage is that beating egg whites involves stirring them vigorously. In the provided extract, it mentions 'Beat egg white until foamy. Stir in sugar, beat again until stiff peaks form.' This process of beating the egg whites until stiff peaks form requires vigorous stirring. Choice A is incorrect because the passage does not mention using a baking rack for cooking the cookies. Choice B is incorrect as the passage provides instructions for baking the cookies in an oven. Choice C is incorrect as the passage does not emphasize the need for gentle folding when mixing in the peanut butter.

Correct Answer: D

Rationale: The correct answer is D because Hedy Lamarr's invention of a frequency-hopping system, along with George Antheil, laid the foundation for technologies like cellular phones, Bluetooth, and Wi-Fi. This significant contribution revolutionized communication technology. Choice A is incorrect because it focuses on the limitations of the era's technology rather than Lamarr's contributions. Choice B is incorrect as it briefly mentions her collaboration but does not directly relate it to technological advancements. Choice C is incorrect as it highlights her failed inventions, which are not indicative of her significant contributions to technology.

Correct Answer: D

Rationale: One of Hedy Lamarr's notable inventions was the frequency-hopping system, which she developed during World War II to secure radio-controlled torpedoes. This system changed frequencies to prevent jamming by enemies. Lamarr's frequency-hopping technology laid the groundwork for modern technologies like cell phones, Bluetooth, and WiFi. Choices A and B are mentioned as some of Lamarr's failed inventions in the passage. Choice C refers to the military technology that inspired Lamarr's invention, not her invention itself.

Correct Answer: A

Rationale: The passage outlines significant events in Clara Barton's life, starting from her birth in Massachusetts, moving to Washington D.C., her humanitarian work during the Civil War, and her later efforts in Europe and with the Red Cross. The most accurate subtitle for this passage would be 'The start of the revolution,' as it refers to the beginning and progression of Barton's revolutionary work in humanitarian aid and establishing the American branch of the International Red Cross Organization. The other choices are not suitable subtitles as they do not encompass the breadth of Barton's impactful life events described in the passage.

Correct Answer: A

Rationale: The author highlights the significance of the contributions made by lesser-known inventors like Lamarr and Antheil.