题目

BASEBALL. It’s just a word, but for millions of Americans it brings much more than a word.Hot dogs. Cold beers. Sunny afternoons. Baseball is the game of fathers and sons. Fathers and sons catch with each other on lawns (草坪) in the US. A father’s favorite team becomes his son’s. Grandfathers talk to their grandsons about games played long ago.Many American kids collect baseball cards. The cards have pictures of their favorite players on them. In school, friends trade (交换) baseball cards just like they trade their lunches. Players are known as “the boys of summer” because peop下列叙述正确的是( )A．使用催化剂能够降低化学反应的反应热(△H)B．金属发生吸氧腐蚀时，被腐蚀的速率和氧气浓度无关C．原电池中发生的反应达平衡时，该电池仍有电流产生D．在同浓度的盐酸中，ZnS可溶而CuS不溶，说明CuS的溶解度比ZnS的小