My family lives in apartment.[ ]
A. an
B. 不填
C. a
答案：A
_______money, the boy had to give up school to support his poor family. [ ]
A. Lacked
B. Lacking of
C. Lacking
D. Lacked of
用指针万用表测量二极管，两次反转测量结果中（）是二极管的正极。
A、阻值小的黑笔
B、阻值小的红笔
C、阻值无穷大的黑笔笔
D、不确定
