Cloze: Choose the BEST answer for each blank in the passages.
Light pollution has become a problem to modern people. Humans are naturally
__26__ beings, meaning that we are active during the day and sleep during the
darkness of night. Because human beings rely heavily on the sense of sight, we have
difficulty __27___ in the darkness, __28___ other animals that can navigate by
hearing or smell. In order to __29__ at night, then, human beings have utilized
various forms of light, ranging from the natural light of fire to various artificial forms
of illumination. As industrial civilization advanced, __30__and sources were created
for both exterior and interior lighting. Beyond the light that humans needed for work
and safe movement, lighting was developed for streetlights, advertising, commercial
areas, such as restaurants and parks, and even sports. 【題組】27. (A) function (B) functioning (C) to function (D) with functioning
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