Mary and Peter were having a picnic with some friends near a river when Mary shouted, “Look!That’s a spaceship up there and it’s going to land here．”

　　Frightened by the strange spaceship, all the young people got into their cars and drove a-way as quickly as possible except peter and Mary．They were more curious(好奇的)than frightened．They watched the spaceship land and saw a door open, but nobody came out, so they went to look into it．In the center of the floor, there was a lot of food．Peter followed Mary into the spaceship and did not hear the door close behind him．The temperature fell in no time and very soon the two young people didn’t know anything．

　　When they came to life, they were surprised to see that they were back by the river again．The spaceship had gone．Their car was nearby．

　　“What happened?” asked Mary．

　　Peter scratched his head, saying slowly, “Don’t ask me．Perhaps we had a problem．Come on．It’s time to go home．”

　　After driving about fifty metres, they found a thick wall made of something like glass stood in their way．On the other side of the wall, a few strange aliens were looking through the wall and reading a notice which, translated into English, said：“New comers at the zoo：a pair of earth villagers in their field with their house on wheels．”

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