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A non-fiction book is always a good reference however, it would need to be based on the true story. When you choose to use a non-fiction book make sure that the Book you are using aligns with historical facts.For most things use a text book  with information you know is entirely accurate. To check do research online and if multiple sources match then its likely to be accurate.

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all of the choices are correct

the effect of the ming leaders banning ships with more than two masts was that there was no further construction of ships masts, because there was a surplus. ming emperors disallowed foreign exploration