GRE Reading Comprehension: PPO-GRE阅读PPO - V3DAUJ6DA1RWO6JWR

The fact that "many of H. erectus' tools were made of basalt or quartz" is relevant to the argument of the passage for which of the following reasons? A. No tools made from these stones have been found in sites associated with H. sapiens. B. These stones must have been deliberately collected for tool use. C. These stones rarely appear in sites dating later than 40 D. The tools formed from these stones could not have been formed without the use of intense heat. E. These stones develop certain characteristics in response to high temperatures.