(C) a once-successful manufacturer of slide rules reacted to the introduction of electronic calculators by trying to make better slide rules
(D) one of the first models of modern accounting machines, designed for use in the banking industry, was purchased by a public library as well as by banks
(E) the inventor of a commonly used anesthetic did not intend the product to be used by dentists, who currently account for almost the entire market for that drug
7. Most archaeologists have held that people first reached the Americas less than 20,000 years ago by crossing a land bridge into North America. But recent discoveries of human shelters in South America dating from 32,000 years ago have led researchers to speculate that people arrived in South America first, after voyaging across the Pacific, and then spread northward.Which of the following, if it were discovered, would be pertinent evidence against the speculation above?
(A) A rock shelter near Pittsburgh, Pennsylvania, contains evidence of use by human beings 19,000 years ago.
(B) Some North American sites of human habitation predate any sites found in South America.
(C) The climate is warmer at the 32,000-year-old south American site than at the oldest known North American site.
(D) The site in South America that was occupied 32,000 years ago was continuously occupied until 6,000 years ago.
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