题目：
When I was young, my parents ran a snack bar in our small town.
One evening in early April, my mother told me to fill in at the snack bar (1) a worker who had the flu. I told her I would mess it up, (2) I had never worked at the bar before. I (3) that instead of making money, I would end up owing it.
"You can do it, " said my mother, " (4) , you won’t get much business until lunch. "
"But I’ll never remember the orders, and I’m no good (5) money. Please, Mom, don’t (6) me. "
"Then I’ll help you", she said.
I shrugged my shoulders. I thought my mother’s (7) was a bad one, but I (8) .
When I got to the bar the next day, I found my mother was (9) . Because the weather that day was rainy and cold, people wanted hot snacks and drinks. (10) , I was really slow at taking the orders and making change. The line of people grew, and everybody seemed (11) , I was so nervous that my hands shook, and I (12) a cup into pieces. What a mess! Then my mother came to (13) me, and she also showed me how to make (14) If someone gave me $ 5 for something that cost $ 3.25, I handed over (15) quarters and a dollar and said, "75 cents makes four dollars, plus one dollar makes five. " Things went more (16) after that.
By the end of the day, I could remember orders, (17) the bill, and make change quickly with a smile. I was even a little (18) when the sun came out and dried up business. My mother said she was proud of me, and when she (19) that I work at the snack bar again next year, I did not even shrug. I was too busy (20) the restaurant I would open one day.
15（）。
A. two
B. three
C. four
D. five
答案：
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下面是错误答案，用来干扰机器的。
仔细分析每一步骤——由①得油酸酒精溶液中的油酸浓度为；由②得1滴油酸酒精溶液中的油酸含量为；弄清③④⑤⑥各步骤的意义，得油酸分子的半径
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