Tuesday was like any other day for Morgan Bieley，15．It was the fourth period，and she was the first student to arrive in the gym for her P．E．class．（71）　　．

"There was a sharp cracking noise and then a loud boom．After that，I didn't remember anything，"said Morgan．

The roof（屋顶） of the gym had fallen down under the heavy snow．Morgan couldn't get away．"I woke up and there was a big piece of wood on my leg．（72）　　．I was starting to get cold．"

Luckily，help was nearby．A new program using "rescue（救援） robots" was tried for the first time．

"We were nervous about using the robot，"said Derric Sneed，the leader of the program．"But in the end the robot gave us exact information．（73）　　．"

The robot was able to go into the gym and find Morgan's place．"Once we made sure where Morgan was and knew it was safe，our men went into rescue her，"says Sneed．"Her leg was broken and she was scared，but thankfully，she was alive．"

Doctors say that Morgan is doing well．（74）　　 ．"I want to meet my hero after I get out of the hospital，"laughs Morgan．"That little robot saved my life!"

A．It went rather well B．I couldn't move C．She should be going home in three days D．Suddenly there was a loud noise．

75．Who does Morgan think her hero is？（回答不多于3个单词）