Re: In certain regions of Mars
[#permalink]
06 Mar 2020, 00:10
In certain regions of Mars, the weather ________________ so wildly that you can feel as though you are experiencing winter and summer in the same day.
The behavior of the weather is described by the adverb "wildly". So it is not a very stable behavior. Also because of this behavior you feel as though you are experiencing summer and winter on the same day. So clearly we can say the weather is "changing wildly", to produce this result. Our own word would be "changing".
From the word list, the choice fluctuates is the correct one.