由于（）原因，需要在内存设计中加入纠错功能
A.不稳定的电源
B.电磁干扰
C.物理故障
D.速度不匹配
参考答案：A, B, D
After decades of effort, the city is still trying to _____ how to ban smoking in public places. [ ]
A. put forward
B. get through
C. wrap up
D. figure out
咽鼓管位于人体的哪个部位：
A．口咽部B．喉咽部C．鼻咽部D．咽旁隙E．咽后隙
