问题
选择题
— English is very useful.
— Yeah, in many countries in the world it ____ a foreign language.[ ]
A．uses as
B．is used as
C．is used for
D．is used by
答案
答案：B
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— English is very useful.
— Yeah, in many countries in the world it ____ a foreign language.[ ]
A．uses as
B．is used as
C．is used for
D．is used by
答案：B
，正电荷
，正电荷
，负电荷
，负电荷