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The number of dark spots that appear on the Sun, known as sunspots, can vary greatly. For example, there were about 180 sunspots in November 2001. blank there were only about 2 sunspots in December 2008.
Which choice completes the text with the most logical transition?
Explanation
Choice D is the best answer. The first sentence claims that the number of sunspots can vary greatly. To support this claim, the next two sentences compare two examples: one time when there were 180 sunspots and one time when there were only 2 sunspots. So the transition “by comparison” fits perfectly.
Choice A is incorrect. This choice uses a transition that indicates a restatement of the same idea, which doesn’t make sense here. This sentence doesn’t restate the first example—it describes a totally different example. Choice B is incorrect. This choice uses a transition that indicates the addition of a similar idea, which doesn’t make sense here. This sentence describes a second example that is very different from the first example. Choice C is incorrect. This choice uses a cause-and-effect transition, which doesn’t make sense here. The first example didn’t result in the second example.