As viewed from space, the Earth’’s distinguishing characteristics are its blue waters and white clouds. Enveloped by an ocean of air consisting of 78% nitrogen and 21% oxygen, the planet is the only one in our solar system known to harbor life. Circling the Sun at an average distance of 149 million km (93 million miles), the Earth is the third planet from the Sun and the fifth largest planet in the solar system. Its rapid spin and molten nickel-iron core give rise to an extensive magnetic field which, coupled with the atmosphere, shields us from nearly all of the harmful radiation coming from the Sun and other stars. Most meteors burn up in the Earth’’s atmosphere before they can strike the surface. The planet’’s active geological processes have left no evidence of the ancient pelting it almost certainly received soon after it was formed. The Earth has a single natural satellite — the Moon.
Approximately how much of the Earth’s atmosAs viewed from space, the Earth’’s distinguishing characteristics are its blue waters and white clouds. Enveloped by an ocean of air consisting of 78% nitrogen and 21% oxygen, the planet is the only one in our solar system known to harbor life. Circling the Sun at an average distance of 149 million km (93 million miles), the Earth is the third planet from the Sun and the fifth largest planet in the solar system. Its rapid spin and molten nickel-iron core give rise to an extensive magnetic field which, coupled with the atmosphere, shields us from nearly all of the harmful radiation coming from the Sun and other stars. Most meteors burn up in the Earth’’s atmosphere before they can strike the surface. The planet’’s active geological processes have left no evidence of the ancient pelting it almost certainly received soon after it was formed. The Earth has a single natural satellite — the Moon.
Approximately how much of the Earth’s atmos
W: It’s Linda’s birthday. She’s 20 years old today. Are you going to her birthday party, Peter
M: Sure, why not Here is a present for her.
W: Is it a book
M: No.
W: Can I open it
M: Yes, go ahead.
W: Wow, a video tape. How nice!
From Richard Halliburton’s Complete Book of Marvels it was said that about a hundred years ago the people of London were amazed to see an extraordinary boat come sailing up the Thames River, which was famous in the world. The boat had four- cornered sails made of mats(帆), big wooden eyes in the bow(船首), and fantastic pictures on the stern(船尾).
The boat that surprised the Londoners turned out to be the Keyling, an eighty - foot junk from Foochow in distant China. The junk had sailed around the Cape of Cape of Good Hope at the southern tip of Africa, up the western coast of Africa, and finally succeeded in getting to England. The voyage had covered fifteen thousand miles - - - more than half the distance around the world.
Ahhough it was unexpected, the Keyling’s voyage to London was no accident at all. Site carried a cargo of silk and ivory which could not be produced in Europe at that time, as well as a number of exotic gifts from the emperor of China,
A. The Keyling which sailed around the tip of the Cape of Good Hope came to London only by accident.
B. The world measures less than 30,000 miles in circumference.
C. The Cape of Good Hope is at the southern tip of Australia.
D. Today many Londoners still believe that many Chinese ships are not seaworthy.
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