I think you are right. This is an issue of parallelism in English. In the last sentence, the words "you are making your brain" start the list. The first "item" on the list is the verb "shrink" and the next "item" is the verb "become"
In order to keep the list parallel (as is proper style in English), the author should have the word "and" before "become" so that the two actions "shrink" and "become" are the two clear parts of the list.
Hopefully this helps!
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October 2, 2016
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The answer is definitely D (integral). Inseparable has a meaning like "cannot be separated from"
If you use inseparable here, it means the hotels and restaurants can't be separated from the city. This use of the word inseparable is very strange in English because everyone knows that you wouldn't even try to separate hotels and restaurants from a city. What would you do with all those places ;-) ?
Hopefully that helps!
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