若N_A表示阿伏加德罗常数的值，下列叙述正确的是[ ]

A．56 g Fe²⁺被氧化时，需要得到N_A个电子

B．2 10.3 mol/LNa₂S溶液中，S^2-离子数是0. 6N_A个

C．1 mol C₄H₁₀含有非极性键数为3N_A个

D．N_A个CO₂分子和N_A个O₂分子的体积相同

These two countries are similar        they both have a high snowfall during winter.

A．to which

B．in which

C．in that

D．except that