we know _______doesn,t travel so fast as light.A,sound B,sounds C,a sound D,the sound (理由)2,all the ______are made of _______,not plastics.A,glasses ,glass B,glass,glasses C,glasses,glasses D,glass,glass

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we know _______doesn,t travel so fast as light.
A,sound B,sounds C,a sound D,the sound (理由)
2,all the ______are made of _______,not plastics.
A,glasses ,glass B,glass,glasses C,glasses,glasses D,glass,glass

1.we know _______doesn,t travel so fast as light.
答案:A,sound
2,all the ______are made of _______,not plastics.
答案:A,glasses ,glass