Cummins' distinction between BICS and CALP predicts that ELL students typically develop conversational fluency in approximately how many years, while academic language proficiency takes:
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A
1-2 years conversational; 3-4 years academic
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B
2-3 years conversational; 5-7 years academic
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C
4-5 years conversational; 8-10 years academic
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D
6 months conversational; 2 years academic