取两份相同质量的铝片，第一份与足量盐酸反应，第二份与足量烧碱反应，同温同压下放出气体的体积比为（ ）
A．1：2
B．2：1
C．1：3
D．1：1
铝与盐酸反应的方程式为2Al+6HCl=2AlCl3+3H2↑，
与烧碱溶液反应的方程式为2Al+2NaOH+2H2O=2NaAlO2+3H2↑，
由方程式可以看出，反应关系式都为2Al～3H2，
相同质量铝产生同温同压下相同体积的气体，
故相同质量的铝片，与足量盐酸反应，与足量烧碱反应，同温同压下放出气体的体积比为1：1，
故选D．
| 从下面方框中选择适当的选项填入短文中，使短文通顺、完整。选项中有两个选项是多余选项。 | |
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| On a snowy evening, a rich lady was standing by the road. She was very worried. Her 1. had broken down. Just then a poor man named Robert came. He was on his way back home from work as usual. The lady wondered, "Is the man going to help me? He looks very cold and hungry." But to her 2. , he stopped and said with a smile, "What's wrong, madam?" The lady told him what was happening. After forty minutes, the car was at last fixed by Robert. The lady wanted to pay him. "No, that's 3. , madam." he said, "I was just helping someone in need. If you really want to pay me back, I hope 4. you see someone in trouble, please give him a hand." A few minutes later, the lady saw a shabby (破旧的) house by the road. She 5. Robert's words, so she stopped. The hostess(女主人) warmly asked her in. The lady could see that was a 6. family and they needed help. When the hostess was making tea in the kitchen, the lady 7. 500 dollars on the table and went away quietly. Robert came home later than before, thinking how hard their life was. Their 8. was to be born the next month but there wasn't 9. money. His wife went up to him, gave him a kiss and said softly, "Don't worry, dear! Everything's going to be all right. A stranger has helped us out." Let's always be ready to help others because helping others is helping 10. . |