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g.Lin Gang : Which is faster?David: They are fall to the ground at the same time.Lin Gang : Really?David: Galileo was the first man to prove it . big ball and the small one fall to the ground at the same time .( )2. Galileo wasn’t the first man to prove it .( ) things fall faster if they are heavier.( ) sound can travel in water ( ) is holding two balls. ( )(16)新 課 標第 一 網(wǎng)請你給外國朋友Tom寫一封信。要求:。,清楚。 個單詞以上。 雷網(wǎng)空