It is assumed in the passage that early humans ______. The comment "This is logical" in Line 7 means ______.

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问题 It is assumed in the passage that early humans ______.
The comment "This is logical" in Line 7 means ______.

选项 A、there is no clear way to determine the extent of our ancestors’ knowledge of plants
B、it is not surprising that early humans had a detailed knowledge of plants
C、it is reasonable to assume that our ancestors behaved very much like people in preindustrial societies
D、human knowledge of plants is well organized and very detailed

答案B

解析 本题为词义题。从该句话出现的上下文可以看出,this指的是前文“关于古代人们对于植物的广泛知识的推断”,因为这些论断是有理论根据的,因此也是合乎逻辑的。后文进一步阐明因为“自古以来植物就是整个食物链的基础,是人类生活的基本依靠”,所以B项是正确的。
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