“不登高山，不知天之高也；不临深溪，不知地之厚也。”这表明（     ）。

读一读，选一选

____ Is your father here today?                           A. No, I don't.

____ What does your mother do?                       B. He's a businessman.

____ Do you want to be a head teacher?            C. No. He's in Australia.

____ What does he do?                                       D. She's a head teacher.