详解
Choice A is the best answer. In lines 3-4("Certain...Net"), the author of Passage 1 provides evidence that the use of screen-based technologies has some positive effects: "Certain cognitive skills are strengthened by our use of computers and the Net."
Choices B, C, and D are incorrect because they do not provide the best evidence that the use of screen-based technologies has some positive effects. Choices B, C, and D introduce and describe the author's reservations about screen-based technologies.