In the transportation field which is not from the application of solar cell？

A、Microwave relay station

B、Optical cable maintenance

C、Wired telephone

D、--

A、Oil drilling platform power supply.

B、Marine testing equipment.

C、A and B.

D、--

a.In addition, no one knows whether the core is solid or not, since it cannot be directly observed.

b.But since the Sun has no solid surface, it is hard to tell where the atmosphere ends and the main body of the Sun begins.

c.Starting at the outside and going down into the Sun, the zones are the corona, chromosphere, photosphere, convection zone, and finally the core.

d.Solar astronomers know that the Sun is divided into five layers or zones.

e.The first three zones are regarded as the Sun’s atmosphere.

The following sentences are from a paragraph, but they are in the wrong order.Choose the correct order from A, B, C, and D.______

A、c-d-e-b-a

B、d-b-a-c-e

C、c-e-d-b-a

D、d-c-e-b-a

Based on information in paragraph 1, which of the following best explains the term "hydrologic cycle"?

A．The movement of water from freshwater bodies into the oceans

B．Solar energy in the atmosphere that produces rain over land and oceans

C．Water resources from oceans and freshwater sources inland

D．Transportation of water from oceans into the atmosphere and onto the land

Detailed knowledge of each of the jet streams of the earth's hemispheres-

its location, altitude and strength-is critical to modern-day weather

forecasting, as well as to more specific applications such as the routing of

Line aircraft. By way of definition, a jet in fluid dynamics is simply a core of fluid

(5) moving at a higher velocity than the surrounding fluid, and although

complicated to describe mathematically, the jet streams in the atmosphere are a

straightforward, natural result of the meridional (equator-to-pole) temperature

gradient in the earth' s atmosphere. Analogous flows exist on other planets with

substantial atmospheres having similar temperature gradients.

(10) The temperature gradient derives from the differential solar heating of the

spherical surface of a planet: the surface is generally warmest at the equator

and grows progressively cooler as one moves poleward. The centrifugal effects

of the earth's rotation, often called the Coriolis force, deflect the north-south

transport of heat from the equator to the poles into the predominantly east-west

(15) motion of the jet stream. The relative strength, or velocity, of the jet stream is

proportional to the intensity of this thermal gradient. During the winter

months, when the equator-to-pole temperature disparity is at its greatest, the

jet stream reaches its maximum velocity, while during the summer months,

when the temperature gradient between the equator and the pole is considerably

(20) less, the jet stream reaches its minimum velocity.

The jet stream does not maintain a straight, zonal flow from west to east

but rather takes on a more serpentine look, often with dramatic dips to the

south or rises to the north. There are two major reasons for these nonzonal

motions: the temperature gradient between the equator and the poles and the

(25) presence of land masses on the earth's surface. The meridional temperature

gradient between the equator and poles that gives rise to the jet stream also

produces secondary atmospheric circulations, or eddies which, referred to by

meteorologists as baroclinic waves, have a complex interaction with the jet

stream, one that is intriguingly two-sided. The eddies modify the distribution of

(30) temperature and kinetic energy within the atmosphere, a process that has a

pronounced effect on the location and movement of the jet stream, which itself

interacts with these waves, acting not only as a transport or steering

mechanism but transferring momentum and energy back to the waves.

The presence of land masses on the earth's otherwise watery surface also

(35) modifies the distribution of temperature, because continents heat and cool at a

dramatically slower rate than do the oceans. The topography of the land also

influences the jet stream's location-mountain ranges and plains on large

continents, for example, significantly imbalance the distribution of atmospheric

temperature, narrowing the jet stream. And since the jet stream is a thermally

(40) driven phenomenon, the more complicated the three-dimensional temperature

structure of the earth's atmosphere, the more "wand

A．interpret data

B．explain research methodology

C．evaluate a conclusion

D．suggest a new technique

E．describe a phenomenon

What is one advantage of solar drip irrigation systems mentioned in the passage?

A.They are more reliable.

B.They have initial advantage.

C.They dont break down from time to time.

D.They are more economical over time.

In the United States the science of climate change still remains a controversial issue. Part of the problems is that it is complex and hard to isolate its parts. We do know how vital it is to life. The atmosphere forms a gaseous, protective envelope around earth protecting the earth from the cold of space, from harmful ultraviolet light, and from all but the largest meteors. After traveling over 93 million miles, solar energy strikes the atmosphere and earth's surface, warming the planet and creating what is known as the "bio sphere" which is the region of earth capable of sustaining life. Atmospheric circulation is one important reason that life on earth can exist at higher latitudes because equatorial heat is transported poleward, moderating the climate.

The atmosphere is not just a protector but also a great transporter. The transport of water vapor in the atmosphere is an important mechanism by which heat energy is redistributed poleward. Heat energy absorbed at the equator is deposited at the poles and the temperature gradient between these regions is reduced. The circulation of the atmosphere and the weather it generates is but one example of the many complex, interdependent events of nature. The web of life depends on the proper functioning of these natural mechanisms for its continued existence.

Some argue that climate change is too complicated to be attributed only to human activity. For example, fossil studies of radiolaria, a group of one-celled animals characterized by silicon-containing shells, have given scientists a fairly accurate account of climatic conditions in the distant past. Geologists found these 450,000-year-old microorganisms pre served in cores of sediment taken beneath the floor of the Indian Ocean. They provide a re cord of cycles of climatic changes, determined by the alternating layers of species of warm and cold-preferring radiolaria. We now have confirmation that changes in the earth's orbital geometry caused the ice ages.

This does not let us off the hook because although we can hardly alter the basic forces at work that alter climate, even small contributions by humans can have dramatic effects. Given nature's interconnectedness, it is possible that the most serious threats have yet to be recognized.

The first paragraph of the text deals mainly with the earth atmosphere's.

A．sheltering effect

B．reviving effect

C．invigorating effect

D．cleansing effect

In the United States the science of climate change still remains a controversial issue. Part of the problem is that it is complex and hard to isolate its parts. We do know how vital it is to life. The atmosphere forms a gaseous, protective envelope around earth protecting the earth from the cold of space, from harmful ultraviolet light, and from all but the largest meteors. After traveling over 93 million miles, solar energy strikes the atmosphere and earth's surface, warming the planet and creating what is known as the "biosphere" which is the region of earth capable of sustaining life. Atmospheric circulation is one important reason that life on earth can exist at higher latitudes because equatorial heat is transported poleward, moderating the climate.

The atmosphere is not just a protector but also a great transporter. The transport of water vapor in the atmosphere is an important mechanism by which heat energy is redistributed poleward. Heat energy absorbed at the equator is deposited at the poles and the temperature gradient between these regions is reduced. The circulation of the atmosphere and the weather it generates is but one example of the many complex, interdependent events of nature. The web of life depends on the proper functioning of these natural mechanisms for its continued existence.

Some argue that climate change is too complicated to be attributed only to human activity. For example, fossil studies of radiolaria, a group of one-celled animals characterized by silicon-containing shells, have given scientists a fairly accurate account of climatic conditions in the distant past. Geologists found these 450, 000-year-old microorganisms preserved in cores of sediment taken beneath the floor of the Indian Ocean. They provide a record of cycles of climatic changes, determined by the alternating layers of species of warm and cold-preferring radiolaria. We now have confirmation that changes in the earth's orbital geometry caused the ice ages.

This does not let us off the hook because although we can hardly alter the basic forces at work that alter climate, even small contributions by humans can have dramatic effects. Given nature's interconnectedness, it is possible that the most serious threats have yet to be recognized.

The first paragraph of the text deals mainly with the earth atmosphere's ______.

A．sheltering effect

B．reviving effect

C．invigorating effect

D．cleansing effect