各种物质按其导电性能，分为导体、（）和（）。
参考答案：半导体；绝缘体
—Hello! This is Henry speaking. I'd like to speak to your father.
—Sorry, he has _____ Shanghai. [ ]
A. been in
B. been to
C. gone to
D. come to
白云石和石灰石混料对配比无影响。（）
