A．desiredB．requiredC．revisedD．deserved
A. desired
B. required
C. revised
D. deserved
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A．UntilB．UnlessC．OnceD．However
A. Until
B. Unless
C. Once
D. However
A．factB．occasionC．caseD．truth
A. fact
B. occasion
C. case
D. truth
A．frankB．hard-workingC．politeD．reserved
A. frank
B. hard-working
C. polite
D. reserved
Which of the following statements is NOT related to light pollution？
A haze of light is formed from artificial lights such as streetlights and building lights.
B. Lights from different sources in the city stream into space and illuminate the night sky.
C. The night sky is illuminated by the lights from big glowing cities in the night.
D. Stargazing becomes difficult because there is a layer of haze in the air.
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