【正文】 few seconds. Do this to warm up the popsicle just a bit. Otherwise, it will be too cold. 21. What do dry ice and mon have in mon? A. Their state after melting. B. Their temperature. C. Their usage. D. Their form. 22. Which material in the following is not a must in making a popsicle? A. Water. B. A spoon. C. sticks D. Cloth 23. What is a tall glass filled with water used for in the experiment? A. To warm the popsicle. B. To harden the popsicle. C. To cool the popsicle. D. To shape the popsicle. B “BANG!” the door caused a reverberation (回聲 ). It was just standing there, with father standing on one side, and me on the other side. We were both in great anger. “Never set foot in this house again!” father stormed. With tears welling up in my eyes, I rushed out of the flat and ran along the street. The street lights were shining, causing rather sad feelings. I wandered aimlessly. A young father who held a child in his arms walked past me. I felt as if I saw my childhood from another space: happy and carefree. But now ? I don’t know whether it is because I have grown up or because dad is getting old. We differ in our ways of thinking. We are just like two people ing from two different worlds. It feels like there is an iron door between us that can never be opened. I wandered the streets, without a destination in mind. My heart was frozen on this hot summer night. As I walked on, there were fewer and fewer people on the streets, until I had only the street lights to keep me pany. When I finally reached the highrise apartment block in which I lived, I saw that the light was still on. I thought to myself: “Is father waiting for me, or is he still angry with me” In fact, it was nothing. Perhaps, dad was throwing away some of his old stamps. Perhaps he thought they were useless. I never had the courage to tell him that I liked collecting stamps. All the lights were off except father’s. Dad was always like this. Maybe he didn’t know how to express himself. After shouting at me, he never showed any mercy or any moments of regret. This was how he always was. He has been a leader for so long that telling everyone else what to do has bee his second nature. The light was still on. “Am I wrong” I whispered, maybe? With the key in my hand, I was as nervous as I had ever been. At last, I decided to open the door. As soon as I opened the door, tears ran down my cheeks. I suddenly realized that the iron door that I had imagined between us did not exist at all. Loveit’s second to none. 24. Which of the following can replace the underlined part in Paragraph 2? A. shouted in relief. B. Burst into anger. C. Burst our crying. D. Jumped in sadness. 25. What does the iron door between “ us” actually refer to? A. Their misunderstandings. B. Their different characters. C. Their ways of thinking. D. The father’ s rudeness. 26. In the author’ s eyes which of the following can be used to describe his father? A. Inconsiderate. B. Indifferent. C. Stubborn. D. Uninterested. 27. What actually contributed to the opening of the iron door in the end? A. The son’ s giving in to his father. B. The regret undertaken by the son. C. The affection between the father and the son. D. The light that was on until late in the night. C Walk through the Amazon rainforest today and you will find it is steamy, warm, damp and thick. But if you had been around 15, 000 years ago, during the last ice age, would it have been the same? For more than 30 years, scientists have been arguing about how rainforests like the Amazon might have reacted to the cold, dry climates of the ice ages, but until now, no one has reached a satisfying answer. Rainforests like the Amazon are important for mopping up CO2 from the atmosphere and helping to slow global warming. Currently the trees in the Amazon take in around 500 million tons of CO2 each year: