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I would also suggest that 'broad categories' would be a lot better than 'large...', which smacks of a 'faux ami' for 'large' [FR]
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5 mins confidence: peer agreement (net): +11
a) according to their structure: _crystalline_ and _noncrystalline_.
Explanation: The more you read the sentences the more they blur into the same meaning because they are both equally valid. However, when I first read these sentences it was letter a) (the most fluent of the two) that made the most immediate sense. I would therefore go with the most obvious and fluent answer.
R-i-c-h-a-r-d Brazil Local time: 00:55 Native speaker of: English