阅读下面短文，从短文后各题所给四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。
Double Trouble
When I was eight, I wanted
a toy and needed $10 to buy it. But, as usual, I was broken. I decided to ask
my 11-year-old sister, Kathleen, for a loan. I went to her room, 1her for the cash. Laughing,
she agreed to2 me the money, but added, "I will charge
you 10 percent compound interest every 3until you pay me back."
"Compound
interest---what's that?" I asked.
"Well, interest is
what you call the4money borrowers have to pay
back on a loan," she explained. "Compound interest means that the
interest payments get bigger and bigger the5you take to pay back the
loan. To repay the loan, you will need to give me $11 after one month. If you
wait two months to pay me back, your6 will grow from $10 to $11. So I'll be charging
you interest on $11. Then I will add that interest to the $11 you already owe
me, for a 7of $12.10. That's what you'll
owe after two months."
"Sure. I get it," I said. Though
truthfully, I was getting 8.
Kathleen lent me the money,
and I bought the toy. My birthday came a month later, and my mom gave me $10. 9, that was just the amount
I needed to buy another toy I wanted 10. I put off paying my
sister for a month. After another month, I11about the loan.
Several months later, on
Christmas morning, my sister and I each found a $02 bill in our stockings. I
was just putting it into my pocket 12Kathleen tapped me on the
shoulder.
Double Trouble
When I was eight, I wanted
a toy and needed $10 to buy it. But, as usual, I was broken. I decided to ask
my 11-year-old sister, Kathleen, for a loan. I went to her room, 1her for the cash. Laughing,
she agreed to2 me the money, but added, "I will charge
you 10 percent compound interest every 3until you pay me back."
"Compound
interest---what's that?" I asked.
"Well, interest is
what you call the4money borrowers have to pay
back on a loan," she explained. "Compound interest means that the
interest payments get bigger and bigger the5you take to pay back the
loan. To repay the loan, you will need to give me $11 after one month. If you
wait two months to pay me back, your6 will grow from $10 to $11. So I'll be charging
you interest on $11. Then I will add that interest to the $11 you already owe
me, for a 7of $12.10. That's what you'll
owe after two months."
"Sure. I get it," I said. Though
truthfully, I was getting 8.
Kathleen lent me the money,
and I bought the toy. My birthday came a month later, and my mom gave me $10. 9, that was just the amount
I needed to buy another toy I wanted 10. I put off paying my
sister for a month. After another month, I11about the loan.
Several months later, on
Christmas morning, my sister and I each found a $02 bill in our stockings. I
was just putting it into my pocket 12Kathleen tapped me on the
shoulder.
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