设NA为阿伏加德罗常数的数值，下列叙述正确的是
A．1molCl2参加反应转移电子数一定为2NA
B．1L0.1mol·L－1氨水含有0.1 NA个OH－
C．10LpH=1的硫酸溶液中含有的H＋离子数为NA
D．常温常温下，2.24L丁烷分子所含的C－H键数为NA
答案：C
A错，如1molCl2与氢氧化钠反应转移电子数一定为NA；B错，氨水为弱碱不能全部电离；C正确，10LpH=1的硫酸溶液中含有的H＋离子的物质的量为1mol；D错，不是在标准状况下；
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| Last night, I was waiting for a taxi. After 5 minutes, I was 1 . The driver seemed to be angry. I asked him what the 2 was. He said he had just come from the airport without a 3 , which was basically $70 in lost fare. Over the course of that ride, the anger slowly 4 . He mentioned he had read an article saying the 5 people are the ones that give, so he hoped he'd have more 6 to give in his life. I was starting to 7 being with him! We continued talking about why 8 is so beneficial both to the giver and the receiver and different ways to 9 it. As we arrived at my destination, I 10 my fare. But I pulled out an extra $20 and said, "Since we've been talking about giving this whole time, I wanted to share that 11 with you. I've already paid my fare, but here's an extra little bit. You can 12 it, since you're already down $70 from the airport. But if you want to experience the 13 of the gift, then tell the next passenger in this taxi that their ride is a gift from another and they can 14 their gratitude in whatever way." The man turned toward me, tears in his eyes, and said, "Sir, I have a better 15 . You give that $20 to a 16 person around here and I'll treat the next passenger with a 17 ride myself." Wow. This man was 18 10 minutes ago. I got out and walked around trying to find someone who needed help 19 heading to my destination. It was an honor meeting that driver and 20 the lesson of how everyone is capable of giving. | ||||
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