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【单选题】

()产出的古动物化石主要包括晚渐新世的巨犀动物群、中中新世的铲齿象动物群、晚中新世的三趾马动物群和早更新世的真马动物群,尤其以三趾马动物群最为丰富。

A.
热河生物群
B.
山东山旺生物群
C.
甘肃和政动物群
D.
贵州关岭动物群
E.
云南澄江动物群
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【单选题】瓮安多细胞动物化石能够证实“达尔文的猜想”的原因是__。

A.
瓮安多细胞动物化石比伊迪卡拉化石群要早2000万年
B.
瓮安多细胞动物化石是非常特化了的生物类型的化石
C.
瓮安多细胞动物化石是5.8亿年前的动物胚胎的化石
D.
瓮安多细胞动物化石是前寒武纪多细胞动物的化石

【单选题】Passage One The climate of earth has fluctuated quite a bit over the last 4.6 billion years of our planet’s history and it can be expected that the climate will continue to change. One o...

A.
The climate of earth has fluctuated quite a hit over the last 4.6 billion years.
B.
An increase in the earth’s temperature will have major consequences for all life on this planet.
C.
The information we have got makes us unable to explain the global warming completely.
D.
The Pleistocene began about 1.8 million years ago.