D.changed his research objectives
答案:C 推理判断题。根据根据第四段第二句话“Instead,he was astonished to discover the opposite.”说明他的发现和他的假设是相反的。
8.Rothschild might have concluded that ichthyosaurs
________.
A.failed to evolve an antidecompression means
B.gradually developed measures against the bends
C.died out because of large sharks and crocodiles
D.evolved an antidecompression means but soon lost it
答案:A 推理判断题。根据最后一段,最初鱼龙处于食物链的顶端,没有动物捕杀它们,所以它们无需急剧浮出水面,因此无bends现象,但是到了鱼龙成为了猎物,所以有了bends现象,而它们没有跟着进化。
阅读下列四篇短文,从每小题后所给的A,B,C或D四个选项中,选出最佳选项。
For five days,Edmonton's Downtown Park is transformed into one huge stage where artists are able to share their talents,and where people are able to celebrate and enjoy themselves.Since its beginning in 1980,the Edmonton Folk Music Festival has been commemorating (纪念) the true feeling of what folk music is all about and that's the traditional togetherness(友爱)that is felt when people gather to share stories and feelings through song.
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