pretest 12; 1/24

lily88888UID: 2828533

Until recently it was thought thta ink used before the sixteenth century did not contain titanium. However, a new type of analysis detected titanium in the ink of the famous Bible printed by JG and in that of another 15th-century Bible known as B-36, though not in the ink of any of numerous other 15th-century books analyzed. This finding is of great significance, since it not only strongly supports the hypothesis that B-36 was printed by G but also shows that the presence of titanium in the ink of the purportedly 15th century Vinland Map can no longer be regarded as a reason for doubting the map's authenticity.

The reasoning in the passage is vulnerable to criticism on the ground that

A. the results of the analysis are interpreted as indicating that the use of titanium as an ingredient in 15th-century ink both was, and was not, extremely restricted.

Both the question stem and the answer are quite mouthfuls.

duijinxiaoziUID: 2585955

use of titanium as an ingredient in 15th-century ink both was extremely restricted --------------》因为只有 G 用，所以可以用来鉴定 G 印的。

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use of titanium as an ingredient in 15th-century ink both was not extremely restricted -----------------》因为 那时候 大家都用，有titanium也不能认为是假的。

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作者用自相矛盾的条件，分别得出了2个结论。