生活大概是在3万多年前，这比专家认为的至少早1.5万年

A.it brings forwards the time in which ancient hunters lived in that area B.it provides the evidence of a high level of ancient human society C.it showed the unexpected ability of the early humans D.it indicates the effect of climate on the movement of early human population 正确答案:B

解析:问题问的是：以下哪个不是这个发现的重要意义？根据第一段及31题答案可知选项A是这个发现的重要意义，根据最后一段可知选项C和D也是这个发现的重要意义

3.Which is the most important discovery among the findings

A.long elephant tusk. B.Ancient stone tools. C.123 bones from animals. D.mammoth tusk covered with small cuts 正确答案:D

解析:问题问的是：以下哪个是这些发现中最重要的一个？根据第三段第一句their most important discovery was a tusk from an ancient elephant called a mammoth(猛犸)，及第三句The tusk is covered with small cuts.可知选项D正确，即带有小的划痕的猛犸象牙

A.25 thousand B.28 thousand C.36 thousand D.40 thousand 正确答案:C

解析:问题问的是：这个象牙有多少年的历史？根据第四段最后一句可知这个象牙有3万6千年历史

5.What did the ancient people need to survive in the extremely cold environment

A.the ability to do the unexpected B.a high level of social development C.thick clothes D.small animals to feed on 正确答案:B

解析:问题问的是：古代人需要什么才能在这样寒冷的环境下生存下来？根据第五段最后一句话，可知需要高等程度的社会发展，所以B是正确的选项

补全短文

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Meteors and Comets