单选题

Fossilized animal bones marked with scratches other than tooth marks were discovered in the sand near some stone tools．When bones were scratched using similar tools, the resulting scratches resembled the scratches found on the fossils．Therefore, stone tools had probably been used on the animal bones that became fossilized．Which of the following, if true, most seriously under- mines the argument？

A、 The fossilized bones with scratches are not as old as nearby fossilized bones found to have tooth marks．
B、 Trampling on sand in which a bone is buried produces scratches on that bone that are similar to those on the fossils．
C、 Stone tools have been found in areas where nearby fossilized bones were not scratched
D、 The stone tools were too hard to be scratched by animal bones
E、 Modern microscopes can clearly reveal the differences between tooth marks and other kinds of scratches．

【正确答案】 B

【答案解析】