There was an earthquake this morning． I was working in front of my computer when it hit the city． The quake started with a sudden loud noise． I thought that something heavy in a neighbor's house probably had fallen． However， the walls and the floor began to shake． I finally realized it was an earthquake．
My son Zac， a sixteenyearold boy， was sleeping with his door locked． Being sixteen， he can sleep through any kind of noise． "Zac！" I shouted． "Are you OK？" But nobody replied． I was a little worried． I couldn't imagine that someone was able to get such a deep sleep． The house was dancing． There were waves in the swimming pool． I was afraid the house would come down． "Zac！" I yelled， knocking on his door with an open palm （手掌）． "Zac! Wake up! It's an earthquake! We need to get out！"
My son finally emerged in his underpants． We looked around the room． I knew that we should hide under a table to stop things from falling on us and stay away from glass． Unfortunately， none of our furniture was designed for hiding under． "Should we go into the garden？" Zac asked． "No， trees could fall on us！" I said． Actually， Zac had done earthquake drills （训练） at school． He must have been told to hide under a desk and cover his head． But we had nothing to cover our heads in the house．
Luckily， before we took any action， the windows stopped moving and the pool calmed down． Everything went back to normal soon． But both my son and I knew what we should do， because we knew if there had been a really big earthquake this morning， we couldn't have escaped from it．



When the earthquake started， the author ______ ．

A. didn't hear anything
B. was repairing her computer
C. didn't consider it an earthquake
D. was sleeping with her door locked

According to Paragraph 2， why was the author worried？ ______

A. Because her son seemed to be in pain．
B. Because she couldn't wake her son up．
C. Because her son was locked in his room．
D. Because she couldn't solve her son's sleep problem．

What problem did the author and her son face？ ______

A. They couldn't get out of the house．
B. They couldn't stop things from falling．
C. They couldn't find anything to hide under．
D. They couldn't remember what to do in an earthquake．

The author and her son most probably realized they should ______ ．

A. replace their furniture
B. build a stronger house
C. receive earthquake drills
D. watch the weather report often