Explanation:

Because only one of the three estimates is correct, we take this as a breakthrough, make assumptions, reason and find out the conclusion that meets the requirements.

(1) Suppose what A says is true, then what B and C say is false. According to what A said, there are at least 1000 books about Xiao Qiang.

From C's story, there is no book about Xiao Qiang.

These two conclusions contradict each other, so the assumption is wrong.

(2) Suppose what B said is true, then what A and C said is false.

To tell the truth, less than 1000 copies of Xiao Qiang's books have been published.

According to A, Xiao Qiang's books are less than 1000.

From C's story, there is no book about Xiao Qiang.

These three conclusions are not contradictory, so the hypothesis holds.

(3) Suppose what C said is true and what A and B said is false.

Xiao Qiang has published less than 1000 books.

More than 65,438+0,000 Xiao Qiang books have been published.

These two conclusions contradict each other, so the assumption is wrong.

To sum up, only hypothesis (2) holds, and there is no book about Xiao Qiang.

In fact, it can be directly seen from the estimates of A and B that their words are contradictory and cannot be established at the same time (that is, they cannot be true or false). There must be a truth and a falsehood (you don't have to worry about which sentence is true). Because only one of the three sentences is true, what C said is false, and there is no book published in Xiao Qiang.

Team Ding was defeated in all three wars.

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