they" in paragraph 2 refers to ______.,,,,creators|==brands|standards|rates">
5
held water" in paragraph 2 could best be replaced by ______.,,,,remained accurate|stayed afloat|==proved valid|maintained course">
8
perpetuates" in paragraph 2 is OPPOSITE in meaning to ____.,,,,diminishes|minimizes|impedes|==curtails">
12
its" in paragraph 2 refers to ______.,,,,==the astrolabe|the rolling motion|the complexity|advancement">
13
protean" in paragraph 4 could best be replaced by ______.,,,,==mutable|volatile|unfamiliar|consistent">
36