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[部优] Section A_第一课时
[部优] Section B_第一课时
[部优] Section D_第一课时
[部优] Section C_第一课时
[部优] Topic 3. Bicycle riding is good exercise.
[部优] opic 3. What were you doing at this time yesterday
[部优] Section C
[部优] Section B
[部优] Section D