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Due to the tilt of Neptune's axis,the Sun heats the planet's northern and southemhemispheres unequally.
A:climates
B:halves
C:atmospheres
D:contours
B:halves
C:atmospheres
D:contours
参考答案
参考解析
解析：本句意思：由于海王星的轴是倾斜的，其南北半球的日射是不均衡的。hemisphere半球。 half半，一半；climate气候；atmosphere大气，气氛；contour外形，轮廓。
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第一篇The Northern LightsThe sun is stormy and has its own kind of weather.It is so hot and active that even the Sun's gravity cannot hold its atmosphere in check!Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour.These particles are called plasma （等离子体）,and the stream of plasma coming from the Sun is called the solar wind.The more active the Sun,the stronger the solar wind.The solar wind constantly streams toward the Earth,but don't worry because a protective magnetic field surrounds our planet.The same magnetic field that makes your compass point north also steers the particles from the Sun to the north and south poles.The charged particles become trapped in magnetic belts around the Earth.When a large blast of solar wind crashes into the Earth's magnetic field,the magnetic field first gets squeezed and then the magnetic field lines break and reconnect.The breaking and reconnecting of the magnetic field lines can cause atomic particles called electrons trapped in the belts to fall into tile Earth's atmosphere at the poles.As the electrons fall to the Earth,they collide with gas molecules in the atmosphere,creating flashes of light in the sky.Each atmospheric gas glows a different color.Oxygen and nitrogen glows red and green arid nitrogen glows violet purple.As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.Watching auroras（北极光）is fun and exciting, but normally you can only see them in places far north like Alaska and Canada.The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate（跳动）,flicker（闪烁）,or even move like waves.During solar maximum,5 auroras are seen as far south as Florida,even Mexico!Auroras often seem to be very close to the ground,but the lowest aurora is still about 100 kilometers above the ground,a distance much higher than clouds are formed or airplanes can fly.A typical aurora band can be thousands of kilometers long,a few hundred kilometers high,but only a few hundred meters thick.We hope you are able to travel to far north places like the Arctic Circle and see the Northern Lights at least once during your lifetime.We know you will never forget it!What is the author's tone toward the Northern Lights?A:Indifferent.B:Sarcastic.C:Sharp.D:Appreciative.
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At the first sight the planet Mars does not appear very welcome to any kind of life．It has very little oxygen and water,the temperature at night is below-50~Cand winds of 100 miles per hour cause severe dust storms．However,the surface of the planet seems to show that water flowed across it some time in the past,and it is believed that there is enough ice at the poles to cover the planet with water if it melts．Although there is no life on the Mars now,some scientists think that there may have been some form of life long time ago．At that time,the planet had active volcanoes;the atmosphere was thicker and warmer;and there was water．In fact,in some ways the Mars may have been similar to the Earth,where life exists.
Some people believe that the Mars could support life in the future if the right conditions were produced．The first step would be to warm the planet using certain gases which trap the Sun's heat in the planet's atmosphere．With warmth,water and carbon dioxide(二氧化碳),simple plants could begin to grow．These plants could slowly make the Mars more suitable for living．It is estimated that the whole process might take between 100,000 and 200,000 years．In the meantime,people could begin to live on the planet in special closed environments．They would provide a lot of useful information about conditions on the Mars and the problems connected with living there.
The author's attitude towards the possibility of life on the Mars in the future is__.A.doubtful
B.positive
C.negative
D.uninterested
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It's our duty to preserve the planet for future（）A、personsB、generationsC、charactersD、nations
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单选题An amplitude of the Sun in high latitudes（）.A
is most accurate before sunriseB
is most accurate after sunsetC
should only be observed when the Sun's lower limb is above the horizonD
is most accurate when the Sun's center is observed on the visible horizon
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单选题The dangerous semicircle of a typhoon in the Southern Hemisphere is that area（）.A
measured from due south clockwise 180°B
measured from due south counterclockwise 180°C
to the left of the storm's trackD
ahead of the typhoon measured from the storm's track to 90°on each side
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单选题A plane perpendicular to the polar axis will never form what line on the Earth’s surface? （）A
Great circleB
EquatorC
Small circleD
Meridian
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单选题Opposition occurs when（）.A
the Sun，Earth，and Moon are at right anglesB
the Sun's declination is 0°and is moving southC
an inferior planet is at the maximum angle to the line of sight to the SunD
the Earth is between a planet and the Sun
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单选题Written in central Canada in the early part of the twentieth century, _______ , depicts life in Manitoda.A
The Midnight Sunwas Victor Frank’s last novelB
Victor Frank’s last novel was The Midnight SunC
The Midnight Sun, which was Victor Frank’s last novelD
Which was Victor Frank’s last novel, The Midnight Sun
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单选题Mice in northern Europe go away from homes when _____.A
they are short of foodB
there is not enough spaceC
it’s getting warmer in the low landD
it’s getting colder in the mountains
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单选题A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）A
The motion of the apparent sun is along the eclipticB
Measurement of time is along the celestial equatorC
The speed of the Earth's revolution is not constantD
There are variations in the Earth's rotational speed
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单选题Without the sun’s light _____ the earth’s surface, it would be so cold that life could not exist on the earth.A
warmsB
warmedC
warmingD
to warm
考题
单选题Superior conjunction occurs when（）.A
the Sun is at maximum declination north or southB
a planet crosses the external plane of the eclipticC
the Sun is between the Earth and a planetD
two planets are in line
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单选题Written in central Canada in the early part of the twentieth century, _____, depicts life in Manitoda.A
The Midnight Sun was Victor Frank’s last novelB
Victor Frank’s last novel was The Midnight SunC
The Midnight Sun, which was Victor Frank’s last novelD
Which was Victor Frank’s last novel, The Midnight Sun
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