It was the first day of biology class. The teacher wanted to give a good1 to his class. He wanted to 2 his students’ eyes to the world of biology.
He knew that 3 young students was not easy, so he worked 4 and tried to find a good way to teach this class.5 thinking for a long time, he made a 6 at last. He decided to show the kids something7 and teach them a lesson at the same time.
He asked his students to 8 carefully. Then he began. He put a worm(虫子) into a glass of water. The worm 9 around in the water. Then he put a second worm into a glass full of alcohol(酒精). It died at once. He asked the students if anyone knew about 10 they learned from it. A boy said, “You showed us that if we drink alcohol we won't have worms.”
