題目
From the 1500s to the mid-nineteenth century ,a period known as the Little
Ice Age , tree rings show that the climate in western North America was much
colder than normal. That favored the grass bison eat ,and they decreased .
When a long, widespread drought ended the Little Ice Age in the mid-1800s ,
the grassed _____ and the bison population crashed.
有三個選項
improved
spread
changed
我選的是 spread 答案卻是 changed
我的觀點因為 bison 愛吃草 , 所以草 decreased
所以當 bison 數量急遽下降導致 grass spread

bison population crashed的原因是因為grasses變少吧？如果grasses spread，bison population反而應該增加才合理。我認為這邊的changed隱含的意思就是grasses decreased，有誤請指正

因果關係 先講的是因 草增加的話bison減少說不通

Grassed打錯字了吧 我覺得changed應該是指植皮改變 不應對於學術文章的用字有過多推論 這題應該是題本出的？我覺得改的不好 一樓的原文寫的比較有邏輯 favored the grasses and they flourished很合理 但題目說favored thegrasses and they decreased 既然氣候適合那種草 草怎麼又會變少？ 這題硬要選還是會選changed 但是題目不好

樓上因為他打錯了 指的是grasses buffaloes not grasses題目純粹是考原本說flourished然後轉折以後你要選相對的