以下哪个事件切换算法没有使用：（）
A.1A
B.2D
C.1B
D.4A
参考答案：D
25. ________ theme of the Shanghai Expo is “Better city, better life”. It will send _____ message to people around the world to care about the places where they live.
A．/…a
B．the…a
C．a…the
D．/…the
胰腺癌时较少出现的临床表现
A．黄疸B．慢性胰腺炎症状C．腹腔积液D．上消化道出血E．静脉血栓形成
