完形填空
There was a little, but always strange girl. Everything was bad for her. She wished to meet an enchantress (女巫) that would turn her life a 1tale.
One day an enchantress came and said that one of her wishes would 2 The girl became very happy at first, but then she started to think that she had a lot of wishes and all of them were 3 for her. She could not 4 just one. Then the 5 enchantress that she would help her realize one wish every day. The girl became 6—now all her dreams will become realities.
From that day on, she was waiting every morning with joy and 7. Then as days passed, the dreams became real ones.... But soon the little girl realized that 8 of the wishes d give her joy and happiness which she 9for. Many wishes brought her disappointment, and some 10 a pain. Almost every dream was an empty little girl's caprice (任性). Though being 11 she suddenly found that she did not 12 this. Soon she started to 13 dreams. She was afraid to 14 every day, waiting for the realization of another wish. Crying, she asked the enchantress to 15 only one her dream-to live as she lived 16and enjoy life.
The good enchantress had 17 upon the little girl. She waved her magic wand and disappeared. The girl was happy 18 she knew that now she would carefully seek for her one big 19 dream, not wasting time with short-term20 quite unnecessary wishes.
m>n，且X、Y、Z三种原子的M电子层中的电子数均为奇数。若按X→Y→Z的顺序，下列说法中正确的是 （ ）