Alex was eating his breakfast with his family one morning. Outside, his dog Tiki, began to bark（犬叫）.Alex's mom was doing the dishes and said,“Alex，please go and see what Tiki is barking at. ”

"Sure, Mom."Alex said. He went outside. The little brown dog was barking at a bush（灌木丛）.“What is it, Tiki？" he asked. Alex suddenly heard a strange sound in the bush. He walked up to it. He saw something move behind the bush.

He pushed the bush aside. A little man stood there. He wore a spacesuit（太空服）.He had a big and round head. He had green skin.

“Please do not hurt me.” the little man said. "Okay," said Alex. For some reason, he did not feel afraid. “Are you from outer space?” he asked with great excitement in his voice. The man said,"Yes. My name is Bort. I come from another planet. My spaceship is out of fuel（燃料用尽）. I need help.”

“What kind of fuel do you need？"Alex asked. Bort took a little bottle out of his bag. "This,"he said. "You have lots of it here on Earth. I believe you call it lemonade（柠檬水）.”He gave the bottle to Alex. Alex opened the top and smelled it. Yeah，it was lemonade." How much do you need?"Alex asked. “About ten thousand gallons（加仑）." said Bort."It is a very big ship."