A.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.
A.When they have a fairly good telescope.
B.When they are in a large city.
C.When the night sky is clear of clouds, moonlight and artificial lights.
D.When the night sky is without haze and fog.
开始考试点击查看答案A.Worried.
B.Optimisti
C.C.Indifferent.
D.Confident.
开始考试点击查看答案A.Governments should make some laws to protect endangered species.
B.People should pay more attention to the protection of natural surroundings.
C.Relevant law must be made and enforced with the support of the people.
D.Some organizations should warn people not to trade in endangered animals.
开始考试点击查看答案A.natural selection of species.
B.various natural disasters.
C.commercial trade and killing.
D.destruction of natural surroundings.
开始考试点击查看答案A.the lands that are completely surrounded by water.
B.the wild animals’ breeding grounds protected by law.
C.the pieces of land separated by modern buildings and roads.
D.the small and isolated areas inhabited by certain species.
开始考试点击查看答案A.Yes. Because the once dark rural areas are polluted by lights.
B.No. Because they can still see stars in rural areas.
C.Yes. Because rural areas are not a good place for astronomers to study stars.
D.No. Because faint light given off by stars can still be seen on a clear night.
开始考试点击查看答案A.Animals may go off course due to the attraction of artificial lights.
B.Animals might be attracted by artificial lights to go into cities.
C.Artificial lights at night may make migrating birds lose their way.
D.Attracted by artificial lights, birds fly into lighted buildings.
开始考试点击查看答案A.The night sky is light colored and stars are black.
B.Lights appear at night and stars are seen in the dark.
C.City lights illuminate the night sky and make stars invisible.
D.City lights at night illuminate stars in the sky.
开始考试点击查看答案A.they can be very large.
B.they can hold as many things as you want to carry.
C.your hands are freed to do other things.
D.you do not have to carry things with you.
开始考试点击查看答案A.It produces electricity for electronic devisees while the wearer walks.
B.It can be used as cell phones, GPS in the military actions or field studies.
C.It is small and convenient.
D.It is light and easy to carry.
开始考试点击查看答案注册安全工程师注册安全工程师安全生产技术2013年安全工程师
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类别:建筑类其它注册安全工程师注册安全工程师安全生产技术2013年安全工程师
类别:建筑类其它注册安全工程师注册安全工程师安全生产技术2013年安全工程师
类别:建筑类其它注册安全工程师注册安全工程师安全生产技术2013年安全工程师
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