目前最好的网络翻译工具来自()。
A.谷歌
B.百度
C.必应
D.有道
参考答案:A
--- Did you hear someone talking in the living room?
--- Oh, I forgot to ____ the TV just now.
A.switch off
B.switch on
C.turn on
D.switch over
下列选项中()是极性分子。
A.Cl2
B.CO2
C.CCl4
D.丙酮(C3H6O)