下列不属于第三产业的是( )。
A．房地产业
B．电力、燃气及水的生产和供应
C．金融业
D．国际组织
参考答案：B
Though suffering constant noise from the outside world, little Tommy was still working with all his
attention _____ on his unfinished warship model.
A．focusing
B．concentrating
C．fixed
D．looking
通常所说的间接触电是指（）造成的.
A.接触带电体
B.碰壳或漏电
C.静电电击
