能正确表示下列化学反应的离子方程式是 [ ]

A．碳酸钙与盐酸反应：CaCO₃+2H⁺=Ca²⁺+CO₂↑+H₂O

B．铜片与浓硝酸反应：Cu+NO₃^-+4H⁺=Cu²⁺+NO↑+2H₂O

C．二氧化锰与浓盐酸反应：

D．硫酸铜与氢氧化钡反应：Ba²⁺+SO₄^2-=BaSO₄↓

Directions:

Write an essay of around 200 words entitled "Most Appreciated Gifts. " In your essay, you should interpret the picture and discuss ways of showing affection for different occasions, and then give your comment on sending hand-written letters.