Interactive TOEFL Reading Walkthrough! (Test Conditions) 

A correction to question 7 - the 4 answers should be (A) While American iron makers developed the latest furnaces, African iron makers continued using earlier techniques. (B) Africans produced iron much earlier than Americans, inventing technologically sophisticated heating systems. (C) Iron making developed earlier in Africa than in the Americas because of the ready availability of carbon and iron ore. (D) Both Africa and the Americas developed the capacity for making iron early, but African metallurgy developed at a slower rate.

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In question 7, the choices are incorrect as it seems.. Can you look into it?