The three first-line examinations of improving the early diagnosis of gastric cancer are：
- A: esophagogastroscopy，cytology of gastric juice，and barium meal X-ray
- B: esophagogastroscopy，acid measure of gastric juice，and barium meal X-ray
- C: esophagogastroscopy，occult blood test of feces，and barium meal X-ray
- D: cytology of gastric juice，occult blood test of feces，and esophagogastroscopy
- E: cytology of gastric juice，tetracycline fluorescence test，and barium meal X-ray
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