微观粒子是化学研究的主要对象，若N_A代表阿伏加德罗常数的数值，下列对粒子数判断正确的是[ ]

A．6．2g氧化钠和7．8g过氧化钠混合物中所含有的离子数为0．7N_A

B．2．8g中含有的碳原子数为0.2N_A

C．5．6g铁粉与硝酸反应失去的电子数一定为0.3N_A

D．标准状况下，22.4LCH₄和CCl₄的混合物所含有的分子数目为N_A

The chart shows household savings as a percentage of income for people living in Hong Kong. Summarise the information by selecting and reporting the main features and by making comparisons where relevant. Write at least 150 words.