题目内容
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The dark clouds suggest a (n) ______ storm.
A．impending
B．surprising
C．fast
D．unexpected
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更多“The dark clouds suggest a （n) ______ storm.A．impendingB．surprisingC．fastD．unexpected”相关的问题
A、The dark clouds having disappeared
B、Having disappeared the dark clouds
C、The dark clouds to disappear
D、With the dark clouds disappeared
______ is a low，even layer of dark grey clouds，with light and dark patches.
A.Cirrostratus
B.Cirrus
C.Stratus
D.Altostratus
A．eruption
B．ejection
C．erosion
D．erection
The first indications a mariner will have of the approach of a warm front will be ______.
A.large cumulonimbus (thunderclouds) building up
B.high cirrus clouds gradually changing to cirrostratus and then to altostratus
C.fog caused by the warm air passing over the cooler water
D.low dark clouds accompanied by intermittent rain
What time is the report being presented？
A．At 8:00.
B．At 10:00.
C．At 12:00.
D．At 2:00.
101.A.the wind B.the clouds C.the rain D.the weather
102.A.Jamie B.his mother C.the fire D.the lights
103.A.Messages B.Accidents C.Troubles D.Questions
104.A.sure B.lucky C.safe D.ready
105.A.lose B.miss C.leave D.forget
Light Night, Dark Stars
Thousands of people aroundthe globe step outside to gaze at their night sky. On a clear night, with no clouds, moonlight, or artificiallights to block the view, people can see more than 14,000 stars in the sky, says Dennis Ward, anastronomer with the University Corporation for Atmospheric Research (UCAR) in Boulder, Colo.But when people are surrounded by city lights, he says, they're lucky to see 150 stars.
If you've ever driventoward a big city at night and seen its glow from a great distance, you've witnessed light pollution. It occurs whenlight from streetlights, office buildings, signs, and other
sources streams into space and illuminates the night sky. This haze oflight makes many stars invisible to people on Earth. Even at night, big citieslike New Yorkglow from light pollution, making stargaz-ing difficult.
Dust and particles ofpollution from factories and industries worsen the effects of lightpollution."If one city has a lot more light pollution than another,"Ward says, "that city will suffer the effectsof light pollution on a muchgreater scale. "
Hazy skies also make it farmore difficult for astronomers to do their jobs.
Cities are getting larger.Suburbs are growing in once dark, rural areas. Light from all this newdevelopment is increasingly obscuring the faint light given off by distantstars. And if scientists can't locate these objects, they can't learn moreabout them.
Light pollution doesn't onlyaffect star visibility. It can harm wildlife too. It's clear that artificiallight can attract animals,'making them go off course. There's increasingevidence, for example, that migrating birds use sunsets and sunrises to helpfind their way, says Sydney Gauthreaux Jr. , a scien- tist at Clemson Universityin South Carolina."When light occurs at night, " he says, "it has a very dis- ruptive influence." Sometimes birds fly into lighted towers, high-rises, and cables fromradio and tele- vision towers. Experts estimate that millions of birds die thisway every year.
41.When can people see 14,000 stars？
A.When they have a fairly good telescope
B.When they are in a large city
C.When the n:ght sky is clear of clouds, moonlight and artificial lights
D.When the night sky is without haze and fog
Not long age, experiments showed that birds rely on the sun to guide them during daylight hours. But what about birds that fly by night？ Tests with artificial stars have proved that certain night - flying birds are able to follow the stars in their long - distance flights.
A dove (鸽子) had spent its lifetime in a cage and had never flown under a natural sky. Yet it showed an inborn ability to use the stars for guidance. The bird's cage was placed under an artificial star - filled sky. (76) The bird tried to fly in the same direction as that taken by his outdoor cousins. Any change in the position of the artificial stars caused a change in the direction of his flight.
(77) But the stars are apparently their principal means of navigation (航行) only. When the stars are hidden by clouds, they seemingly find their way by such landmarks as mountain ranges, coast lines, and river courses. But when it's too dark to see these, the doves circle helplessly, unable to find their way.
The reason why birds don't get lost on long flights ______.
A．have been known to scientists for many years
B．have only recently been discovered
C．are known by us
D．will probably remain a mystery
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