52. The best heading for this passage is ___.
1. Baby broccoli may fight cancer
2. Broccoli is found useful
3. SGS is important for the body
4. Cancer cells can be killed
53. The verb “boost” (line 3) can be best replaced by ___.
1. advance 2. preserve
3. expand 4. improve
54. In this passage, the word that means “producing the expected results” is ___.
1. effective 2. concentrated
3. patented 4. available