— You can hardly swim, can you? 　

—           . But my mother says she'll teach me during my summer holiday. [ ]

A. Yes, I can't　　　

B. No, I can　　

C. No, I can't　

D. Yes, I can

在哈罗德模型中，实际增长率、有保证的增长率和自然增长率总是一致的。