- Vocabulário | Vocabulary
- Sinônimos | Synonyms
- Formação de palavras (prefixos e sufixos) | Word formation (prefix and suffix)
Space power: The dream of beaming solar energy from orbit


(Available at: www.bbc.com/future/article/20251029-the-beam-dream-should-we-build-solar-farms-in-space–
text specially adapted for this test).
( )The word “feasible” (l. 28) could be replaced by “achievable” without changing the meaning.
( ) The prefix un– in “uncertain” (l. 38) and “unrealistic” (l. 17) indicates reversal of action, similar to the verb “undo”.
( ) The word “viable” (l. 32) refers to something that can function successfully.
( ) The term “renewable” (l. 14) is formed by the addition of the prefix re- and the suffix -able, which mean, respectively, “not” and “capability/possibility”.
The correct order of filling in the parentheses, from top to bottom, is:
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