A new look at an asteroid orbiting the
sun shows it could possibly smash into the Earth with tremendous force.
But experts say the potential impact is still 872 years away, time enough
for the speeding space rock to alter its course.
Named 1950DA,
the asteroid--1 kilometer wide--is the most threatening to the Earth of all of
the known large asteroids, but the odds are only adout one in 300 that it would
impact the planet, researchers said. "One in 300 is pretty long odds," said Jon
D. Giorgini, a scientist in Califonia. "I’m not personally going to worry about
it. It is so far in the future that lots of things could change."
There are approximately 1,000 asteroids bigger than a kilometer that can
pass near the Earth in their orbit of the sun. About 580 have been found and
their orbits plotted. Of these, only 1950DA represen
A. Possible Asteroid Smash in the Future
B. New Discoveries about 1950DA
C. Asteroids in the Solar System
D. Future Threat--An Asteroid Smash into the Earth
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[单项选择] Passage Five
A new look at an asteroid orbiting the
sun shows it could possibly smash into the Earth with tremendous force.
But experts say the potential impact is still 872 years away, time enough
for the speeding space rock to alter its course.
Named 1950DA,
the asteroid--1 kilometer wide--is the most threatening to the Earth of all of
the known large asteroids, but the odds are only adout one in 300 that it would
impact the planet, researchers said. "One in 300 is pretty long odds," said Jon
D. Giorgini, a scientist in Califonia. "I’m not personally going to worry about
it. It is so far in the future that lots of things could change."
There are approximately 1,000 asteroids bigger than a kilometer that can
pass near the Earth in their orbit of the sun. About 580 have been found and
their orbits plotted. Of these, only 1950DA represen
A. nothing can alter the course of an asteroid in its orbit of the sun
B. only about one in 300 asteroids near the sun would hit the Earth
C. scientist have managed to identify all the asteroids orbiting the sun
D. there is no immediate threat to the Earth from an asteroid
[单项选择] Passage Five
A new kind of radar has been developed
for spaceship travelers. A working laboratory model of a new system of radar
that makes use of a beam of light is said to be ten thousand times more accurate
than the best comparable system of radar that used microwaves.
The model has shown that this radar system, known as laser-doppler radar,
can measure with absolute precision speeds varying from spaceship orbital
injection (进入) velocities (速度) of five miles per second down to virtual
stops—speeds of less than one ten thousandth of an inch per second. According to
the scientists who are developing this system, such fine measures of velocity
are of prime importance in space missions. In a rendezvous (对接) between two
spaceships, or in a landing approach by a vehicle onto an orbiting space
station, a bump could rip open a ship’s skin, or a
A. measures the movements of a spaceship by means of light beam
B. makes use of microwaves
C. makes use of sound waves
D. Both A and B
[填空题]The houses on the top of the mountain look small only because they are much (far) ______.
[单项选择]The project to build five new schools in this region ______ by the end of the next year.
A. will have been completed
B. will have completed
C. is being completed
D. has been completed
[填空题]Replace the dots with a word to make five new words.
(...) SURFER/SHIELD/SOCK/MILL/PIPE
[单项选择] Passage Five
Probably the hardest part of setting
goals is the first step of actually deciding to take action! The first barrier
facing most people is the incorrect assumption that goals are only for business
people. The reality is everyone sets goals mentally throughout the day. There
are always occasions where something has to be done at a particular time or in a
particular place. Simple examples could be getting up at a certain time in order
to be at work, or to meet with a friend for a leisure activity.
The beauty of having goals is the uniqueness of each one to the goal
setter. Whether it is personal, financial, business or spiritual, they are all
specific to that person and their circumstances.
The most
important part initially is to write them down. Having goals written down gives
you incredible power while helping you to focus o
A. goals are set mostly for important things
B. most people know when it is time to set goals
C. people set goals to get things done all the time
D. it is necessary to set goals occasionally
[填空题]People look up new words in it.
[单项选择]Passage Five
There is currently abroad a new wave of appreciation for breadth of knowledge. Curricula at universities and colleges and programs in federal agencies extol the virtues of a broad education. For scientists who work in specialized jobs, it is a pleasure to escape in our spare time to read broadly in fields distant from our own. Some of us have made interdisciplinary study our occupation, which is no surprise, because much of the intellectual action in our society today lies at the interfaces between traditional disciplines. Environmental science is a good example, because it frequently requires us to be conversant in several different sciences and even some unscientific fields.
Experiencing this breadth of knowledge is stimulating, but so is delving deeply into a subject.
Both are wonderful experiences that are complementary practical and aesthetic ways. They are like viewing the marvelous sculpture of knowledge in two different ways. Look at the sculpture fr
A. have zeal for the totality of the knowledge sculpture
B. represent the depth and breadth of knowledge
C. are necessarily supposed to belittle the other
D. can be qualified as environmental scientists
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