If the can't skim, for example if they are a foreign language speaker of low-intermediate ability (as I am in 5 or 6 languages, and I am also a professional language teacher among other things), then I expect them to know that they can't skim, and make appropriate allowances.
If the can't skim, for example if they are a foreign language speaker of low-intermediate ability (as I am in 5 or 6 languages, and I am also a professional language teacher among other things), then I expect them to know that they can't skim, and make appropriate allowances.