问题
选择题
当酸碱恰好完全中和时，下列叙述中正确的是 [ ]
A、反应的离子方程式为：H++OH-==H2O
B、加入酸的浓度、体积与加入碱的浓度、体积相等
C、酸中的c（H+）与加入碱的c（OH-）相等
D、加入酸提供的n（H+）与加入碱提供的n（OH-）相等
答案
答案：D
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当酸碱恰好完全中和时，下列叙述中正确的是 [ ]
A、反应的离子方程式为：H++OH-==H2O
B、加入酸的浓度、体积与加入碱的浓度、体积相等
C、酸中的c（H+）与加入碱的c（OH-）相等
D、加入酸提供的n（H+）与加入碱提供的n（OH-）相等
答案：D
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| I was a single parent of four small children, working at a low-paid job. Money was always tight, but we had a 1 over our heads, food on the table, clothes on our backs, and if not a lot, always 2 . Not knowing we were poor, my kids (孩子们) just thought I was 3 . I've always been glad about that. It was Christmas time, and although there wasn't 4 for a lot of gifts, we planned to celebrate with a family party. But the big 5 for the kids was the fun of Christmas 6 . They planned weeks ahead of time, asking 7 what they wanted for Christmas. Fortunately, I had saved $120 for 8 to share by all five of us. The big 9 arrived. I gave each kid a twenty-dollar bill and 10 them to look for gifts of about four dollars each. Then everyone scattered (散开). We had two hours to shop; then we would 11 back at the "Santa's Workshop". Driving home, everyone was in high Christmas spirits, 12 my younger daughter, Ginger, who was unusuall y 13 . She had only one small, flat bag with a few candies-fifty-cent candies! I was so angry, but I didn't say anything 14 we got home. I called her into my bedroom and closed the door, 15 to be angry again. This is what she told me. "I was looking 16 thinking of what to buy, and I 17 to read the little cards on the 'Giving Trees.' One was for a little girl, four years old, and all she 18 for Christmas was a doll (玩具娃娃). So I took the card off the tree and 19 the doll for her. We have so much and she doesn't have anything." I never felt so 20 as I did that day. | ||||
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