从根本上说，一个政府能否具有权威是由国家性质决定的。（  ）

某小组将调查的生物进行分类：鲫鱼、金鱼、水草、螃蟹、荷花等归为一类，松、柏、月季、鼠、苍蝇等生物归为一类．他们分类的方法为（  ）

      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.”

在化学反应6CO₂+6H₂OC₆H₁₂O₆+6O₂中没有涉及到的物质类别是（　　）