题目

 — Will you like to pay basketball with us this afternoon? —         . I have to study for tomorrow’s test. A. I’d love to          B. I’m afraid not  C.  Sounds good          D. No problem 答案：B将纯锌片和纯铜片按图示方式插入同浓度的稀硫酸中一段时间，以下叙述正确的是 (   )  A. 两烧杯中铜片表面均无气泡产生           B. 甲中铜片是正极，乙中铜片是负极 C. 两烧杯中溶液的pH均增大                D. 产生气泡的速度甲比乙慢