()是公益性组织。
A.安全机构
B.各种党派团体
C.社会福利机构
参考答案:A
—Where's my MP5 player?I can't find it.
—You'd better ______ it carefully in your bedroom. [ ]
A. look up
B. look through
C. look for
D. look at
具有良好导电性能的物体称为导体。