The International Dark-Sky Association is an organization that________.
A. strongly opposes outdoor lighting service
B. has lost some money in energy trade
C. has profited from the lighting business
D. makes efforts to reduce light pollution
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What the author’s attitude towards people’s desire for success？
Approving.
B. Disapproving.
C. Unclear.
D. Critical.
The author implies what the troubled boys needed most was _________.
A. strict guidance in proper behavior
B. challenging demand in hard work
C. sympathy and tolerance from adults
D. understanding and trust from others
People who work at night_______.
A. lose the chance to gaze stars
B. have a higher risk of health problem
C. have less exposure to white light
D. are to blame for light pollution
俗称“空气开关”的是()。
A. 低压断路器
B. 低压刀开关
C. 刀熔开关
D. 低压负荷开关
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