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 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 s
A. Humans have built over most of the craters.
B. Most meteors fell into the ocean and not on land.
C. The Earth’s magnetic field repelled most meteors.
D. The Earth’s natural geologic activity has eliminated most traces.
更多"As viewed from space, the Earth&rsq"的相关试题:
[单项选择]
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 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 s
A. One-fourth
B. One-half
C. Three-fourths
D. All of it
[填空题]Jackson:
Viewed from a scientist’s standpoint, all of the energy contained in fuel either now or in the future becomes heat. Some of the heat is used directly or produces useful work. The rest is lost or rejected. That is to say, it is radiated into the atmosphere from the engines, motors, furnaces, power lines, television sets, boilers and all the other energy-consuming machinery that makes our wheels go around.
Browning:
It is necessary to improve the efficiency with which we use energy in order to do more work. But improvement cannot come overnight, and there are limits beyond which not even science can help. According to the Center for Strategic and International studies, about three quarters of the energy we use to move things, including ourselves, accomplishes no useful work.
Jeffry:
In terms of efficiency, buses, trains, and other forms of public transportation may be using energy more efficiently than private automobiles. Unless p
[单项选择]One of the most important features that distinguish reading from listening is the nature of the audience. (67) the writer often does not know who will read what he writes, he must (68) to be as clear as possible. Time can be taken to plan the piece of writing so that it is eventually organized into some sort of (69) sequence of events or ideas. When we speak, however, we normally have very little time to plan what we (70) to say. Since we are actually (71) our audience face to face we may (72) some of the information we believe our audience shares. And the more (73) we are with our audience, the more information we are likely to leave out. In any (74) they can always stop and ask a question or ask for (75) if we have left out too much. A reader, however, cannot do this but can at least attempt comprehension at his own speed; (76) , he can stop and go backwards or forwards, <
A. run
B. sort
C. fill
D. count
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