GRE Text Completion Question 602
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Source: XDF
The philosopher Karl Popper held that it is not possible to conclusively prove but that it is possible to (i)_____a scientific hypothesis. His argument is founded on the basic (ii)_____underlying all inductive reasoning from which scientific principles are derived: in Popper's words, “ The logical situation is extremely simple. No number of white swans can establish the theory that all swans are white: the first observation of a black swan can (iii)_____it. ”
| Blank(i) | Blank(ii) | Blank(iii) |
|---|---|---|
| A qualify | D flaw | G validate |
| B conclusively disprove | E supplement | H refute |
| C tentatively corroborate | F ratiocination | I substantiate |