Na última frase, o autor apresenta uma:

Which of the alternatives bellow completes the text?

O núcleo do sujeito do verbo belongs no início do texto, é

The statement "Native speakers may feel the language 'belongs' to them," (lines 24-25) means that native speakers:

The main purpose of this text is to:

It is possible to deduce from lines 13-18 that:

In "Industries that produce or use energy continually look for ways to improve efficien," (lines 23-24), "look for" can be correctly substituted by:

In the sentence "since this is a key to making their products more competitive." (lines 24-25), the word "since":

A "pollution-free" energy source (line 27) means an energy source that is free of pollution. Check the option in which the phrase is also correctly explained.

According to Paragraph 4, the "ideal energy source":