[单项选择]

A．Very Slow Ride

The surface of the earth may seem very stable to you. But you might be amazed if you knew some of the things that are going on under that surface.
The earth has an outer shell of rigid pieces called tectonic plates (地壳构造板块). The plates include both ocean floor and dry land. Some have whole continents on top of them. The continents on top of the plates are just going along for a slow ride, moving only about four inches per year. But even this small movement causes three types of big interactions.
One type is ocean ridges. These ridges develop in places where two plates are moving away from each other. As the plates separate, hot magma (岩浆) flows up to fill the space. New crust (地壳) builds up on the plate boundaries and causes ocean ridges. These ridges form long mountain ranges, which only rise above the ocean surface in a few places.
Another type of reaction-trenches-occurs between two
A. "a place for horses"
B. "calm and easygoing"
C. "steady or firm"
D. "a collection of animals"

[单项选择]

 

The surface of the earth may seem very stable to you. But you might be amazed if you knew some of the things that are going on under that surface.
The earth has an outer shell of rigid pieces called tectonic plates (地壳构造板块). The plates include both ocean floor and dry land. Some have whole continents on top of them. The continents on top of the plates are just going along for a slow ride, moving only about four inches per year. But even this small movement causes three types of big interactions.
One type is ocean ridges. These ridges develop in places where two plates are moving away from each other. As the plates separate, hot magma (岩浆) flows up to fill the space. New crust (地壳) builds up on the plate boundaries and causes ocean ridges. These ridges form long mountain ranges, which only rise above the ocean surface in a few places.
Another type of reaction-trenches
A. the sea floor in the Atlantic Ocean
B. the Himalayan Mountains
C. Europe
D. India

[单项选择]

 

The surface of the earth may seem very stable to you. But you might be amazed if you knew some of the things that are going on under that surface.
The earth has an outer shell of rigid pieces called tectonic plates (地壳构造板块). The plates include both ocean floor and dry land. Some have whole continents on top of them. The continents on top of the plates are just going along for a slow ride, moving only about four inches per year. But even this small movement causes three types of big interactions.
One type is ocean ridges. These ridges develop in places where two plates are moving away from each other. As the plates separate, hot magma (岩浆) flows up to fill the space. New crust (地壳) builds up on the plate boundaries and causes ocean ridges. These ridges form long mountain ranges, which only rise above the ocean surface in a few places.
Another type of reaction-trenches-occurs b
A. effects of movements of the earth’s plates
B. different types of continents
C. the Marianas Trench
D. transform faults

[填空题]The average surface temperature of Earth keeps around 15℃.

[单项选择]Ever since human inhabited the earth, they have made use of various forms of communication. Generally, this expression of thoughts and feelings has been in the form of oral speech. When there is a language harrier, communication is accomplished through sign language in which motions stand for letters, words and ideas. Tourists, the deaf and the mute have to use this form of expression. Many of these symbols of whole words are very picturesque and exact and can be used internationally; spelling, however, cannot.
Body language transmits ideas or thoughts by certain actions, either intentionally or unintentionally. A wink can be a way of flirting or indicating that the person is only joking. A nod signifies approval, while shaking the head indicates a negative reaction.
Other forms of nonlinguistic language can be found in Braille (a system of raised dots read with the finger tips), signal flags, Morse code and smoke signals. Road maps and picture signs also guide, warn and inst
A. When language is a barrier, people will find other forms of communication.
B. Everybody uses only one form of communication.
C. Nonlinguistic language is invaluable to foreigners.
D. Although other forms of communication exist, verbalization is the fastest.

[单项选择]

All the useful energy at the surface of the earth comes from the activity of the sun. The sun heats and feeds creatures and mankind. Each year it provides men with two hundred million tons of grain and nearly ten million tons of wood, coal, oil, natural gas, and all other fuels are stored energy from the sun. (80) Some was collected by this season’ s plants as carbon compounds. Some was stored by plants and trees ages ago. Even waterpower derives from the sun. Water turned into vapor by the sun fails as rain. It courses down the mountains and is converted to electric power. Light transmits only the energy that comes from the sun’ s outer layer, and much of this energy that is directed towards the earth never arrives. About nine tenths of it is absorbed by the atmosphere of the earth. In fact, the earth itself gets only one half millionth of the sun’s entire output of radiant energy.

The largest part of the light energy directed towards the earth is （
A. stored up by the plants
B. absorbed by the earth’ s atmosphere
C. stored up by the animals in the form of body fat
D. used for electric power