单选题 The sentence" Put your heart into your singing" in the last paragraph means ______.

【正确答案】 A
【答案解析】[A]“全身心投入地唱”,与原句意思最相近,故[A]正确。[D]“费力地唱”,[C]为“高兴地唱”,[D]“努力去唱”。