第二节(共10小题;每小题1.5分,满分15分)
阅读下面短文,在空白处填入1个适当的单词或括号内单词的
正确形式。
The brightness of light from our cities has reached such high
levels that it is reducing the
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(dark)of night.A century
ago,when night-time
62
(fall),the dark of night arrived.
Things are
63
(difference)today.A new study reports that
artificial light at night is increasing around the world.Scientists
say it grew
64
2.2%a year between 2012 and 2016.This in-
trusion (of artificial light is causing us many problems.
The International Dark-Sky Association says,"it is not only
damaging our view of the universe,but it is
65
severe
threatening our environment,our safety,our
r energy