阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项，并在答题纸上将该项涂黑。
A
This past Columbus Day, my husband and I went fishing with some friends on their boat while our 10 and 8-year-olds were in school. We left the house all at the same time, about 7 am. My children walked to and from school every day and we knew they were OK for a couple hours by themselves any-way so we told them to go inside after school and we would be home around 4 pm
The adults decided to go fishing offshore: we live on the Gulf Coast, since it was a beautiful day in the normally still very humid (湿热的) Texas fall. At around 2 pm we started back to shore and then we ran out of gas. Even worse, we were out of cellphone service, and 911 wasn't working, and we didn't have a radio so we were stuck waiting for someone to come by.We were out there until10 pm. All the while, my children were at home, expecting us to return shortly after they got home. At about 7 pm, when it was getting dark, my 10-year-old girl thought something might be wrong so she walked to each house on the street until someone answered the door and asked them what they should do. This was how we were found.
Talking with that neighbor the next day, I never took such pride in my children. This neighbor explained to me how calm both my children were when explaining the situation and how impressed they were with my children seeking help, even though they didn't know these particular neighbors. I never doubled them for a minute, though next time we go fishing, we'll monitor the gas more carefully.
21．How did the children go to school?
A．By bus. B．By car. C．By boat. D．On foot.
22．What happened to the author and her husband?
A．They used up their gas. B．They lost their cell phones.
C．They found a radio on shore. D．They fell into the water.
23．What did the author feel after knowing her children's behavior?
A．Worried. B．Proud. C．Doubtful. D．Confident
