GRE Text Completion Question 761
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Source: Red
Unlike the easily studied neutral and ionized (i) _____ that compose the primary disk of the Milky Way itself, the components of the (ii) _____ surrounding our galaxy have proved more resistant to study.
| Blank(i) | Blank(ii) |
|---|---|
| A materials | D fluctuations |
| B calculations | E region |
| C figments | F problems |