题目内容：
The summer before I went off to college, Mom stood me in her usual spot behind the ironing board （烫衣板）and said, “Pay attention: I'm going to teach you to iron.”Mom clearly explained her 21 for this lesson. I was going to be 22 and needed to learn this vital skill. Also, I would be meeting new people, and properly ironed clothes would help me make a good 23 .
“Learn to iron a shirt,” com Mom said, “and you can iron anything.”
But ironing shirts was not 24 work. It didn't make use of long muscles we used to throw a baseball，and it wasn't a 25 operation like ice-skating. Ironing was like driving a car on a street that has a stop sign every 10 feet, Moreover, an iron produced steam and it carried an element of 26 .If you touched the wrong part of it, you'd get burnt. If you forgot to turn it off when you 27 ,you might bum down the house.
As for technique, Mom 28 me to begin with the flat spaces outward, always pushing the iron forward into wrinkled （有褶皱的）parts.
Collars had to be done right. Mom said they were close to your face, where everyone would 29 them.
30 the years, I've learned to iron shirts skillfully, which gives me a sense of 31 Whatever failures I suffer in my life, an ironed shirt tells me I am good at something. 32 ,through ironing I've learned the method for solving even the most 33 problems.
“ 34 wrinkles one at a time,” as Mom might have said, “and before long everything 35 get ironed out.”
A．reasons
B．rules
C．emotions
D．methods
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