21．As we all know.there is electric field inside earth. A．a(chǎn)n,不填 B．a(chǎn)n,the C．the,the D．不填,不填 【查看更多】

 

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As we all know，there is ________electric field inside ________earth.

A．a(chǎn)n；不填         B．a(chǎn)n；the          C．the；the         D．不填；不填

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As we all know，there is ________electric field inside ________earth.

　 A．a(chǎn)n；不填　　　　　 B．a(chǎn)n；the　 　 C．the；the　　　 　 D．不填；不填

 

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