每日背誦第五期60
Dinosaurs were once found all over the earth. Now they are gone. They have all died out. No one is sure how this happened. Some scientists believe the weather changed. Some believe disease killed them all. All that we can be sure of is that once they lived.
恐龍?jiān)椴嫉厍虻拿總€(gè)角落，現(xiàn)在他們沒(méi)了，全部都滅絕了。沒(méi)有人確定這是怎么發(fā)生的。一些科學(xué)家認(rèn)為氣候變了，還有一些認(rèn)為是疾病導(dǎo)致它們滅絕。我們所能確定的就是它們?cè)?jīng)生存過(guò)。
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