A：把金属铁放入稀硫酸中：Fe+2H+═Fe3++H2↑
B：往碳酸镁中滴加稀盐酸：CO32﹣+2H+═CO2↑+H2O
C：氢氧化铜加到盐酸中：Cu（OH）2+2H+═Cu2++2H2O
D：氢氧化钡溶液与稀硫酸反应：Ba2++SO42﹣+H++OH﹣═Ba SO4↓+H2O
对政府权力进行制约和监督要建立健全权力运行的监督体系，这个体系要靠（ ）
读问句，选择对应的答句。
____ ①Let's go to the library. A. Yes, I do.
____ ②Where is the teacher's office? B. Yes, it is.
____ ③Do you have lunch at school? C. Forty-six.
____ ④How many desks are there in your class? D. OK.
____ ⑤Is that your pencil? E. It's on the first floor.
