OG6 阅读 Q49

Choice D is the best answer. In lines 69-71("Even...technology"), the passage states that "even longer-term, Green is betting on silicon, aiming to take advantage of the huge reductions in cost already seen with the technology." In this context, the phrase "betting on" most nearly means "optimistic about," as the sentence implies that Green has positive expectations for silicon use now and in the future. 
Choice A is incorrect because "dabbling in" a subject implies being only minimally involved with it, but in lines 69-71("Even...technology"), Green is shown to be committed to silicon use. Choice B is incorrect because in this context the phrase "betting on" is figurative and implies believing in something, not actually being involved with games of chance. Choice C is incorrect because Green is said to want to "take advantage" of silicon use, meaning he does not intend to switch from it.