题目内容：
Whatdoestheauthormeanbysaying"butit'sonethingtoimproveaperson'sabilitytoseewordsandquiteanotherthingtoimprovehisabilitytoreadatextefficiently."inthesecondparagraph? A．Theabilitytoseewordsisnotneededwhenanefficientreadingisconducted,
B．Thereadingexercisesmentionedcan'thelptoimproveboththeabilitytoseeandtocomprehendwords.
C．Thereadingexercisesmentionedcan'thelptoimproveanefficientreading.
D．Thereadingexercisesmentionedhavedoneagreatjobtoimproveone'sabilitytoseewords.
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