OG详解-OG6 文法 Q28

Choice D is the best answer. The sentence contrasts the number of meteorite falls with the number of meteorite finds, noting that there have been over 60,000 meteorite finds but only about 1,200 recorded meteorite falls.
Choice A is incorrect. While the sentence explains the difference between meteorite falls and meteorite finds, it doesn’t contrast the number of meteorite falls and meteorite finds. Choice B is incorrect. The sentence indicates the two categories of meteorites found on Earth; it doesn’t contrast the number of meteorite falls and meteorite finds. Choice C is incorrect. While the sentence notes the number of recorded meteorite falls, it doesn’t contrast this with the number of meteorite finds.