A. They could not play all the notes of the scale. B. They were not able to pick up the trumpet. C. They could not play simple tunes. D. They had difficulty improving upon the trumpet. 参考答案:A 答案解析:[分析] 细节推理题。文章第二段第二句话非常长,主要是因为instrument后面跟了五个并列的定语从句。其中,第二个定语从句enable the performer to play all the
第20题: [单项选择]注射吗啡时可见 A. 血和尿淀粉酶活性升高伴脂肪酶活性升高 B. 血清S型淀粉酶升高而P型淀粉酶正常,脂肪酶活性不升高 C. 血清S型淀粉酶和P型淀粉酶可同时升高,也可为2型中任何一型升高 D. 血清淀粉酶活性升高伴尿淀粉酶活性降低 E. 血清淀粉酶活性升高以S型为主,36小时恢复正常 参考答案:E