1.(2) The ostrich buries its head in the sand and digs a hole with its mouth to prepare for hatching eggs. (3) Epang Palace in history was not actually built. (4) You can't see the Great Wall of Wan Li from space.

2.( 1) Truth is a theory that may be falsified (answer "If a theory is complacent and irrefutable and there is no possibility of being falsified, then it can't be true").

? (2) Truth is a process of constantly putting forward hypotheses and being falsified.

3.( 1) Promote the progress and development of human knowledge. (2) changed the traditional view and corrected the fallacy.