足量铜与一定量浓硝酸反应，得到硝酸铜溶液和NO₂、N₂O₄、NO的混合气体，这些气体与1.68L O₂（标准状况）混合后通入水中，所有气体完全被水吸收生成硝酸．若向所得硝酸铜溶液中加入5mol•L^﹣1 NaOH溶液至Cu²⁺恰好完全沉淀，则消耗NaOH溶液的体积是（   ）

Tang Hai is chatting with his e-pal David on QQ (T: Tang Hai   D: David)
D: Hi. How is it going these days?
T: Pretty good! We celebrated our Dragon Boat Festival(端午节) last week.
D: Dragon Boat Festival?1
T: To remember an ancient Chinese poet(诗人)。
D: How do you usually celebrate it? 
T:2 But this year, we did something more interesting.
D: What did you do?
T: Our school had a Dragon Boat race.
D:3 who won the race?
T: Our class.
D:4
T: Thanks a lot. I hope you can come to China sometime.
D:5 I'm interested in Chinese traditions. Tell me more about them next time.
T: Ok, I will. See you.
D: See you!

有些射性元素要经历一系列的衰变才能稳定，关于X、Y、Z三个原子核的衰变方和如下：

X→ ${}_{82}^{206}$ Pb+8 ${}_2^4$ He+6 ${}_{-1}^0$ e    

Y→ ${}_{82}^{207}$ Pb+7 ${}_2^4$ He+4 ${}_{-1}^0$ e 

Z→ ${}_{82}^{208}$ Pb+6 ${}_2^4$ He+4 ${}_{-1}^0$ e

根据以上方程可以推断在X、Y和Z中，下列正确的是（   ）

“黄袍加身”的典故与哪一位皇帝有关（    ）