第三部分：阅读理解（共20小题；每小题2分,满分40分）
When Chato's barking didn't stir Jerrica Seals, the recently adopted dog triednibbling on the teenager's leg, to get the girl out of her burning house.
No one was hurt. Fort Myers firefighters responded at about 7 a.m.
Five people lived in the Garcia home. That was neighbor Janice Hamilton's main concern when she looked out of her window Friday and saw the flames. "I just threw my pants on to run outside and make sure they knew how many people lived there," Hamilton said. "It was scary."
"Seals called me screaming," said Leticia Vega, 36, the sister of Seal's boyfriend, Javier Garcia, 23, who owns the home. "She said the dog woke her up barking, jumped on the bed and bit her on the leg."
It is said that Garcia's brother brought Chato home several weeks ago after the animal wandered onto a Lehigh Acres construction site. Since then, Vega said, Chato had been mostly quiet－until it mattered. "He doesn't usually bark." Vega said. "He's real friendly."
According to deputy fire chief Steve Clyatt, possibly the fire started because of an inadequate extension cord used on a window air conditioner. More than half of the home was burned down. There was extensive smoke and water damage in the remainder of the structure. Estimates for repair costs were unavailable. "I'd say it's unlikely they will recover this, but I've been surprised before," Clyatt said.
61.Which of the following would be the best title for the passage?
A. Janice Hamilton Helps Save Neighbors
B. Firefighters Put Out House Fire
C. Dogs Saves Teen Girl From House Fire
D. Family Needs Help Due To House Fire
62.The underlined word "they" in the third paragraph most probably refers to________.
A. other neighbors B. Hamilton family members
C. Vega and her brother Garcia D. the firefighters
63.By saying "I'd say it's unlikely they will recover this, but I've been surprised before." in the last paragraph, Clyatt means________.
A. it's a wonder that Seals survived the fire B. the house was badly damaged
C. such a bad fire was seldom seen D. Chato is a very clever dog
64.According to the passage, which of the following is NOT mentioned?
A. The person who called the firefighters. B. The possible cause of the accident.
C. The relationship between Seals and Garcia. D. The owner of the house.
，
，可得
，故两钉子间的距离为
，故A正确；
,解得
,即当被A绊住后的半周期长为5s，故t=10.5s时，小球还没有被B绊住，故拉力为
，B正确；
，解得
，C错误
，解得
，D正确；