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Susan had long blonde hair and big blue eyes.So did most of the other1in her school class，which troubled her a lot.“I look like everyone else！I'm not special！I'm bored！”Susan2to her mother.
She decided to try to make herself look3She painted big pink spots on her neck and when she didn't get attention，she stuck a long plastic nose on top of her real nose.Nobody noticed that，4.She took ink(墨水)and poured it all over her5.She wore clown(小丑)clothes to school and stuck leaves in her ears.6no matter what she did，she still didn't get any7and nobody thought she was special.
One morning her8went to wake her up and told her to get ready for school.She made Susan9the ink out of her hair and clean her neck.“I'm not going to school10！I'm bored！”She buried(埋葬)her head11the quilt and cried.
“Susan，”her mother said，“you are different.You are unique(独一无二)and special.12in the world looks just like you.Some people have blonde hair like you and some have blue eyes like you，but none of them has your smile or the twinkle in your eyes or your pink face.Nobody laughs like you，either.Now13and get ready for school.”
Susan went to school that day and looked at all the other kids in her class.“Mom was14.Nobody looks just like me.”Susan said.“I am special.I am unique and I am not15！”
3CO2+4H2O，则x的数值是（ ）