GRE Text Completion Question 2952
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Source: 1992
Manipulating laboratory tissue cultures with hormones is one thing; using hormones to treat human beings, however, is contingent on whether hormones that (i)_____ in the laboratory can affect(ii)_____ organisms, and in predictable ways.
- A develop.. similar
- B succeed.. simple
- C fail.. cellular
- D work.. whole
- E reproduce.. unknown