单项选择题

A．The soil has been overworked.
B．The climate is cold.
C．The weather is too dry.
D．The soil is sandy.
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(S1) According to the author, the most important quality for learning a language well is________.
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(S3) A better language learner doesn’t have to be more________, but is likely to have more________ than a poorer one.
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