题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 Is our planet heating up? Are humanbeings to blame for climate change? The discussion on this subject hasbeen heated, but what are scientists actually saying? At Reader's Digest, we decided to find it out. Yes, it has, and even warmer. Greenlandwas forested between 450,000 and 800,000 years ago, so temperatures wereconsiderably warmer then. There have also been other times of relatively hightemperatures. So why does the concern exist? It's all about the speed at which t西欧各国希望开辟通往东方的新航路，直接目的是（ ）A.学习东方先进文化 B.证明地球是圆的 C.到东方寻找财富 D.促进东西方贸易发展