【Eric Chang】評論

請修改題目為45 Over the past 3.5 billion years, roughly how many asteroids may have hit Earth? (A) 14  (B) 85(C) 113(D)11 

【【站僕】摩檸Morning】評論

原本題目:請依下文回答第 44 題至第 47 題 Some 66m years ago Earth was hit by a space rock reckoned to have been 10km across. The resulting chaoscaused the extinction of dinosaurs and many other species, opening the way for the age of mammals－and ultimatelyhumans. It also left a big hole in what is now southern Mexico. That hole is one of only three known of similardimensions (the other two are Vredefort in South Africa and Sudbury in Canada). And this is odd. For, during thebillions of years that Earth has had a solid crust, many more than three big asteroids might have been expected to h...

【上榜了！謝謝阿和摩友們！】評論

Allowing for this, Earthnwould have been hit by 113, give or take 11, of them. Either way, a lot ofncraters are missing. 考慮到這一點(還有其他行星)，地球可能已經受到113個隕石的撞擊(加減11個)。無論哪種計算方法，可知是已有許多隕石坑都不見了。