请输入或粘贴题目内容
搜题
拍照、语音搜题，请扫码下载APP
题目内容
（请给出正确答案）
When the sun becomes a red giant, what will conditions be like on Earth？
A．Its atmosphere will freeze and become solid.
B．It will be enveloped in the expanding surface of the sun.
C．It will become too hot for life to exist.
D．It will be nearly destroyed by nova explosions.
答案
更多“When the sun becomes a red giant, what will conditions be like on Earth？A．Its atmosphere w”相关的问题
第1题
A．The x-ray part of the spectrum.
B．Electromagnetic space.
C．The solar surface.
D．Interplanetory space.
第2题
What will probably be the first stage of change as the sun becomes a red giant？
A．Its core will cool off and use less fuel.
B．Its surface will become hotter and shrink.
C．It will use up its thermonuclear energy.
D．Its center will grow smaller and hotter.
第3题
阅读材料，回答题。
The Adjustment in Understanding of Man"s Relation to the Physical Universe
Nowadays the scattering of galaxies and the astounding abundance of stars are forcing those who ponder such matters to a further adjustment of their concept of the place and function of man in the material universe.
In the history of the51human mind， with its increasing knowledge of the surrounding context， there must have been a time when the philosophers of the52tribes began to realize that the world was not simply centered on man himself. The geocentric concept， which accepted a universe centered on the earth， then became common53
The second adjustment in the understanding of man"s relation to the physical universe was not generally acceptable54the sixteenth century. Copernican revolution soundly55the heliocentric Concept， the theory of a universe56on the sun. Man is a stubborn adherent to official dogma; eventually， however， he accepted the sun as the center.
Then， forty years ago， came the need for a third adjustment. This57has deeply exploded man"s pride and58， for it has carried with it the knowledge of the appalling number of galaxies.
The galactocentric universe59puts the earth and its life near the edge of one great galaxy in a universe of millions of galaxies. Man becomes peripheral among the billions of stars of his own Milky Way; and， according to the revelations of paleontology and geochemistry， he is60and apparently transient in the61of cosmic time.
The downgrading of the earth and sun and the elevation of the galaxies is not the end of this62of scientific pilgrims through philosophic fields. The need for another63adjustment now64not wholly unexpected by scientists，65wholly the result of one or two scientific revelations.
Our new problem concerns the spread of life throughout the universe. As unsolicited spokesmen for all the earthly organisms of land， sea， and air， we ask the thrilling question: Are we alone？
请在第__（51）__处填上正确答案。 查看材料
A.ingenious
B.evolving
C.creative
D.eligible
第4题
The year is 2094. It has been announced that a comet is heading towards the Earth. Most of it will miss our planet, but two fragments will probably hit the southern part of the Earth. The news has caused panic.
On 17 July, a fragment four kilometers wide enters the Earth' s atmosphere with a huge explosion. About half of the fragment is destroyed. But the major part survives and hits the South Atlantic at 200 times the speed of sound. The sea boils and an enormous wave is created and spreads. The wall of water rashes towards southern Africa at 800 kilometres an hour. Cities On the African coast are totally destroyed and millions of people are drowned. The wave moves into the Indian Ocean and heads towards Asia.
Millions of people are already dead in the southern part of the Earth, but the north won't escape for long. Tons of broken pieces are thrown into the atmosphere by the explosions. As the sun is hidden by clouds of dust, temperatures around the world fall to almost zero. Crops are mined. Wars break out as countries fight for food. A year later civilization has collapsed. No more than 10 million people have survived.
Could it really happen？ In fact, it has already happened more than once in the history of the Earth. The dinosaurs(恐龙)were on the Earth for over 160 million years. Then 65 million years ago they suddenly disappeared. Many scientists believe that the Earth was hit by a space fragment. The dinosaurs couldn't survive in the cold climate that followed and they became extinct. Will we meet the same end？
Which of the following is NOT TRUE according to the author's description of the disaster in 2094？
A．The whole world becomes extremely cold.
B．All the coastal cities in Africa are destroyed.
C．The whole mankind becomes extinct.
D．The visit of the comet results in wars.
第5题
B
In July 1994 Jupiter, the largest planet in our solar system, was struck by 21 pieces of a comet (彗星). When the fragments (碎片) landed in the southern part of the giant planet, the explosions were watched by scientists here on earth. But what if our own planet was hit by a comet？
The year is 2094. It has been announced that a comet is heading towards the Earth. Most of it will miss our planet, but two fragments will probably hit the southern part of the Earth. The news has caused panic.
On 17 July , a fragment four kilometers wide enters the Earth ' s atmosphere with a huge explosion. About half of the fragment is destroyed. But the major part survives and hits the South Atlantic at 200 times the speed of sound. The sea boils and an enormous wave is created and spreads.
The wall of water rushes towards southern Africa at 800 kilometres an hour. Cities on the African coast are totally destroyed and millions of people are drowned. The wave moves into the Indian Ocean and heads towards Asia.
Millions of people are already dead in the southern part of the Earth, but the north won' t escape for long. Tons of broken pieces are thrown into the atmosphere by the explosions. As the sun is hidden by clouds of dust, temperatures around the world fall to almost zero. Crops are ruined. Wars break out as countries fight for food. A year later civilization has collapsed. No more than 10 million people have survived.
Could it really happen？ In fact, it has akeady happened more than once in the history of the Earth. The dinosaurs(恐龙)were on the Earth for over 160 million years. Then 65 million years ago they suddenly disappeared. Many scientists believe that the Earth was hit by a space fragment.
The dinosaurs couldn ' t survive in the cold climate that followed and they became extinct. Will we eet the same end？
61. Which of the following is NOT TRUE according to the author ' s description of the disaster in 2094？
[ A] The whole world becomes extremely cold.
[ B ] All the coastal cities in Africa are destroyed.
[ C] The whole mankind becomes extinct.
[ D] The visit of the comet results in wars.
第6题
The Sea
What do you know about the sea？ We know that it looks very pretty when the sun is shining on it. We also know that it can be very rough when there is a strong wind．What other things do we know about it？
The first thing to remember is that the sea is very big. When you look at the map of the world you will find there is more water than land．The sea covers three quarters of the world.
The sea is also very deep in some places. It is not deep everywhere. Some parts of the sea are very shallow. But in some places the depth of the sea is very great. There is one spot, near Japan, where the sea is nearly 11 kilometers deep! The highest mountain in the world is about 9 kilometers high. If that mountain were put into the sea at that place, there would be 2 kilometers of water above it! What a deep place!
If you have swum in the sea, you know that it is salty. You can taste the salt. Rivers, which flow into the sea, carry salt from the land into the sea. Some parts of the sea are saltier than other parts. There is one sea, called the dead Sea, which is very salty. It is so salty that swimmers cannot sink! Fish cannot live, in the Dead Sea!
In most parts of the sea, there are plenty of fishes and plants. Some live near the top of the sea. Others live deep down. There are also millions of tiny living things that float in the sea. These floating things are so small that it is hard to see them. Many fishes live by eating these.
The sea can be very cold．Divers, who go deep down in the sea, know this. On the top the water may be warm. When the diver goes downwards, the sea becomes colder and colder. Another thing happens. When the diver goes deeper, the water above presses down on him. It squeezes him. Then the diver has to wear clothes made of metal. But be cannot go very deep. Some people who wanted to go very deep used a very strong diving ship. They went down to the deepest part of the sea in it. They went down to a depth of eleven kilometers !
第 41 题 When does the sea look beautiful？
A．When it is calm.
B．When the weather is fine.
C．When there is a strong wind.
D．When there is a storm.
第7题
A．overdose B．overflow C．overdraft D．overexposure
第8题
One' s brain becomes blank when he or she doesn' t have a dream.
A．Y
B．N
C．NG
第9题
What does "it" of "since water-vapor becomes water when it cools" in Para. 3. refer to？
A．Water-vapor.
B．Cloud.
C．Water.
D．Air.
第10题
When filled with a gas______ lighter than air, a balloon becomes buoyant and rises.
A．much
B．more
C．less
D．little
