单项选择题

A．Use a soft to blur images slightly.
B．Focus on some other subjects.
C．Make the pictures more clear.
D．Combine two pictures.
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单项选择题
A．Beginners.B．Intermediate learners.C．Learners of special English.D．Beginners knowing ABC.
A．Beginners.
B．Intermediate learners.
C．Learners of special English.
D．Beginners knowing ABC.
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