题目

下列物质露置于空气中，质量会变小的是（ ） A．浓硫酸B．浓盐酸C．生石灰D．氯化钠 答案：分析：根据常见物质的物理和化学性质依次分析即可，浓硫酸具有吸水性；浓盐酸具有挥发性；氧化钙露置在空气中吸水并与二氧化碳反应导；氯化钠在空气中质量几乎不会变化． 解答：解：A、浓硫酸具有吸水性，能吸收空气中水蒸气，质量增加，故A错； B、浓盐酸具有挥发性，质量要减少，故B对；The story took place in a small town in winter. One day a man met an old lady standing by an expensive car. It was clear that her car broke down. So he stopped his old truck and got out. Although he was smiling, the old lady was worried. “Is he going to hurt me?”The man could see that she was frightened, so in his friendliest voice he said, “I’m here to help you, madam. Why don’t you wait in the car to get warm? By the way, my name is Bryan Anderson.” It took Bryan about fifty minutes to fix the car. The lady felt quite thankful and she asked how much she should pay him.But Bryan wanted no money. ①对他来说，帮助别人很正常。He said, “If you want to repay me, next time you see someone in need, just give out your friendly hand.”After saying goodbye, the lady continued down the road till she reached a small café. She stopped for something to eat. As the pretty waitress stood next to her, the lady noticed she was nearly eight months pregnant (怀孕). ②Although she looked tired, she still served the customers with a smile on her face. As the old lady was going to pay the $10 bill, she remembered Bryan’s words.The old lady paid one hundred-dollar bill. But when the waitress returned with the change, the lady was gone. On the table she saw a small note. Her eyes were filled with tears when she read it, “Somebody once helped me the way I’m helping you. If you want to pay me back, continue being kind to others. ” Under the note were nine more $100 bills. Was the old lady an angel? The waitress was so excited that she called her husband to tell the story. “Bryan…Bryan Anderson my dear… you’re not going to believe what has happened… ”Love needs to be passed on. Everyone can be an angel.请根据短文内容完成下列任务。1.Did the old lady believe in Bryan at the beginning of the story? Why?___________________________________________________________________________2.请将划线句子①翻译成英语。___________________________________________________________________________3.请将划线句子②翻译成汉语。___________________________________________________________________________4.请根据短文内容将句子补充完整, 使句子意思连贯。The waitress found__________________________ and ___________________________on the tablewhen she returned with the change.5.What have you learned from the story? (with one sentence)____________________________________________________________________________