君子曰：学不可以已。——《荀子》

古之学者必有师。——韩愈

没有拿来的，人不能自成为新人，没有拿来的，文艺不能自成为新文艺。——鲁迅

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    The Grand Ole Opry, in Nashville, Tennessee, has always been America's most important concert hall for country music. Every Saturday night the place is filled with country music 1  .

    One 2 in January 1967, it was a very 3 night at the Opry. For the first time, a 4 man was an attraction. 5 music had always been thought of as “white music”. For many, it was a strange 6 to see Charley Pride step 7 the Opry stage. Some people felt 8 about whether a black man could sing country songs. 9 Charley's smooth voice quickly 10 over the Opry 11   . Charley was so good that before long, he was the country music's biggest 12   .

    Like many country singers, Charley was 13 on a farm. He spent his youth milking cows and picking cotton. But he knew he wasn't going to make 14 his career. Later he became a baseball player.  

Charley made it to a major league team. But he didn't stay on for more than one season.

    In the winter, after the baseball season, Charley 15 at a local nightclub. One evening, Red Sovine, a great country music star, 16 Charley sing. Red told Charley to sing. He told Charley to forget about 17 and go for a singing career.  

    Charley took the 18 and became a true hit maker. His 19 were always near the top on the list. Some were number 1 all over the country.  

    Today Charley Pride is 20 one of the biggest stars in country music. But he says his real wish is to own a baseball team.  

则下列分析都正确的组合是（   ）

①Ⅰ图对应溶液中的溶质为NaHCO₃

②Ⅱ图对应溶液中的溶质为Na₂CO₃和NaHCO₃ ， 且二者的物质的量之比为1：1

③Ⅲ图对应溶液中的溶质为NaOH和NaHCO₃ ， 且二者的物质的量之比为1：1

④Ⅳ图对应溶液中的溶质为Na₂CO₃ ．

, the more you wish to learn.