The passage is mainly about . A. why humans domesticated horses B. how humans and horses needed each other C. why horses came in different shapes and sizes D. how human societies and horses influenced each other 答案 59.B 60.D 61.C 62.D Passage 5 Far from the land of Antarctica , a huge shelf of ice meets the ocean. At the underside of the shelf there lives a small fish, the Antarctic cod. For forty years scientists have been curious about that fish. How does it live where most fish would freeze to death? It must have some secrets. The Antarctic is not a comfortable place to work and research has been slow. Now it seems we have an answer. Research was begun by cutting holes in the ice and catching the fish. Scientists studied the fish’s blood and measured its freezing point. The fish were taken from seawater that had a temperature of -1.88℃ and many tiny pieces of ice floating in it. The blood of the fish did not begin to freeze until its temperature was lowered to -2.05℃. That small difference is enough for the fish to live at the freezing temperature of the ice-salt mixture. The scientists’ next research job was clear: Find out what in the fish’s blood kept it from freezing. Their search led to some really strange things made up of a protein never before seen in the blood of a fish. When it was removed, the blood froze at seawater temperature. When it was put back, the blood again had its antifreeze quality and a lowered freezing point. Study showed that it is an unusual kind of protein. It has many small sugar molecules held in special positions within each big protein molecule. Because of its sugar content.it is called a glycoprotein. So it has come to be called the antifreeze fish glycoprotein,or AFGP. 查看更多

 

题目列表(包括答案和解析)

  Domestic(驯养的)horses now pull ploughs, race in the Kentucky Derby, and carry police.But early horses weren’t tame(驯服的)enough to perform these kinds of tasks.Scientists think the first interactions humans had with horses were far different from those today.

  Thousands of years ago, people killed the wild horses that lived around them for food.Over time, people began to catch the animals and raise them.This was the first step in domestication.

  As people began to tame and ride horses, they chose to keep those animals that had more desirable characteristics.For example, people may have chosen to keep horses that had a gentle personality so they could be ridden more easily.People who used horses to pull heavy loads would have chosen to keep stronger animals.Characteristics like strength are partly controlled by the animals’ genes.So as the domesticated horses reproduced, they passed the characteristics on to their young.Each new generation of houses would show more of these chosen characteristics.

  Modern day horse breeds come in a wide variety of shapes and sizes.This variety didn’t exist in the horse population before domestication.The Shetland horse is one of the smallest breeds-typically reaching only one meter tall.With short, strong legs, the animals were bred to pull coal out of mine shafts(矿井)with low ceilings.Huge horses like the Clydesdale came on the scene around 1700.People bred these heavy, tall horses to pull large vehicles used for carrying heavy loads.

  The domestication of horses has had great effects on societies.For example, horse were important tools in the advancement of modern agriculture.Using them to pull ploughs and carry heavy loads allowed people to farm more efficiently.Before they were able to ride horses, humans had to cross land on foot.Riding horses allowed people to travel far greater distance in much less time.That encouraged populations living in different areas to interact with one another.The new from of rapid transportation helped cultures spread around the world.

(1)

Before domestication horses were ________.

[  ]

A.

caught for sports

B.

hunted for food

C.

made to pull ploughs

D.

used to carry people

(2)

The author uses the Shetland horse as an example to show ________.

[  ]

A.

it is smaller than the Clydesdale horse

B.

horse used to have gentle personalities

C.

some horses have better shaped than others

D.

horses were of less variety before domestication

(3)

Horses contributed to the spread of culture by ________.

[  ]

A.

carrying heavy loads

B.

changing farming methods

C.

serving as a means of transport

D.

advancing agriculture in different areas

(4)

The passage is mainly about ________.

[  ]

A.

why humans domesticated horses

B.

how humans and horses needed each other

C.

why horses came in different shapes and sizes

D.

how human societies and horses influenced each other

查看答案和解析>>

B
Domestic (驯养的) horses now pull ploughs, race in the Kentucky Derby, and carry police. But early horses weren’t tame (驯服的) enough to perform these kinds of tasks. Scientists think the first interactions humans had with horses were far different from those today.
Thousands of years ago, people killed the wild horses that lived around them for food. Over time, people began to catch the animals and raise them. This was the first step in domestication.
As people began to tame and ride horses, they chose to keep those animals that had more desirable characteristics. For example, people may have chosen to keep horses that had a gentle personality so they could be ridden more easily. People who used horses to pull heavy loads would have chosen to keep stronger animals. Characteristics like strength are partly controlled by the animals’ genes. So as the domesticated horses reproduced, they passed the characteristics on to their young. Each new generation of houses would show more of these chosen characteristics.
Modern day horse breeds come in a wide variety of shapes and sizes. This variety didn’t exist in the horse population before domestication. The Shetland horse is one of the smallest breeds—typically reaching only one meter tall. With short, strong legs, the animals were bred to pull coal out of mine shafts (矿井) with low ceilings. Huge horses like the Clydesdale came on the scene around 1700. People bred these heavy, tall horses to pull large vehicles used for carrying heavy loads.
The domestication of horses has had great effects on societies. For example, horse were important tools in the advancement of modern agriculture. Using them to pull ploughs and carry heavy loads allowed people to farm more efficiently. Before they were able to ride horses, humans had to cross land on foot. Riding horses allowed people to travel far greater distance in much less time. That encouraged populations living in different areas to interact with one another. The new from of rapid transportation helped cultures spread around the world.
【小题1】Before domestication horses were ______.

A.caught for sports B.hunted for food
C.made to pull ploughsD.used to carry people
【小题2】The author uses the Shetland horse as an example to show ______.
A.it is smaller than the Clydesdale horseB.horse used to have gentle personalities
C.some horses have better shaped than others
D.horses were of less variety before domestication
【小题3】Horses contributed to the spread of culture by ______.
A.carrying heavy loadsB.changing farming methods
C.serving as a means of transportD.advancing agriculture in different areas
【小题4】The passage is mainly about _______.
A.why humans domesticated horsesB.how humans and horses needed each other
C.why horses came in different shapes and sizes
D.how human societies and horses influenced each other

查看答案和解析>>

Domestic (驯养的) horses now pull ploughs, race in the Kentucky Derby, and carry police. But early horses weren’t tame (驯服的) enough to perform these kinds of tasks. Scientists think the first interactions humans had with horses were far different from those today.

Thousands of years ago, people killed the wild horses that lived around them for food. Over time, people began to catch the animals and raise them. This was the first step in domestication.

As people began to tame and ride horses, they chose to keep those animals that had more desirable characteristics. For example, people may have chosen to keep horses that had a gentle personality so they could be ridden more easily. People who used horses to pull heavy loads would have chosen to keep stronger animals. Characteristics like strength are partly controlled by the animals’ genes. So as the domesticated horses reproduced, they passed the characteristics on to their young. Each new generation of houses would show more of these chosen characteristics.

Modern day horse breeds come in a wide variety of shapes and sizes. This variety didn’t exist in the horse population before domestication. The Shetland horse is one of the smallest breeds—typically reaching only one meter tall. With short, strong legs, the animals were bred to pull coal out of mine shafts (矿井) with low ceilings. Huge horses like the Clydesdale came on the scene around 1700. People bred these heavy, tall horses to pull large vehicles used for carrying heavy loads.

The domestication of horses has had great effects on societies. For example, horse were important tools in the advancement of modern agriculture. Using them to pull ploughs and carry heavy loads allowed people to farm more efficiently. Before they were able to ride horses, humans had to cross land on foot. Riding horses allowed people to travel far greater distance in much less time. That encouraged populations living in different areas to interact with one another. The new from of rapid transportation helped cultures spread around the world.

1. Before domestication horses were ______.

A. caught for sports

B. hunted for food

C. made to pull ploughs

D. used to carry people

2. The author uses the Shetland horse as an example to show ______.

A. it is smaller than the Clydesdale horse

B. horse used to have gentle personalities

C. some horses have better shaped than others

D. horses were of less variety before domestication

3.Horses contributed to the spread of culture by ______.

A. carrying heavy loads

B. changing farming methods

C. serving as a means of transport

D. advancing agriculture in different areas

4. The passage is mainly about _______.

A. why humans domesticated horses

B. how humans and horses needed each other

C. why horses came in different shapes and sizes

D. how human societies and horses influenced each other

 

查看答案和解析>>

 

Domestic (驯养的) horses now pull ploughs, race in the Kentucky Derby, and carry police. But early horses weren’t tame (驯服的) enough to perform these kinds of tasks. Scientists think the first interactions humans had with horses were far different from those today.

Thousands of years ago, people killed the wild horses that lived around them for food. Over time, people began to catch the animals and raise them. This was the first step in domestication.

As people began to tame and ride horses, they chose to keep those animals that had more desirable characteristics. For example, people may have chosen to keep horses that had a gentle personality so they could be ridden more easily. People who used horses to pull heavy loads would have chosen to keep stronger animals. Characteristics like strength are partly controlled by the animals’ genes. So as the domesticated horses reproduced, they passed the characteristics on to their young. Each new generation of houses would show more of these chosen characteristics.

Modern day horse breeds come in a wide variety of shapes and sizes. This variety didn’t exist in the horse population before domestication. The Shetland horse is one of the smallest breeds—typically reaching only one meter tall. With short, strong legs, the animals were bred to pull coal out of mine shafts (矿井) with low ceilings. Huge horses like the Clydesdale came on the scene around 1700. People bred these heavy, tall horses to pull large vehicles used for carrying heavy loads.

The domestication of horses has had great effects on societies. For example, horse were important tools in the advancement of modern agriculture. Using them to pull ploughs and carry heavy loads allowed people to farm more efficiently. Before they were able to ride horses, humans had to cross land on foot. Riding horses allowed people to travel far greater distance in much less time. That encouraged populations living in different areas to interact with one another. The new from of rapid transportation helped cultures spread around the world.

1.Before domestication horses were ______.

A. caught for sports

B. hunted for food

C. made to pull ploughs

D. used to carry people

2.The author uses the Shetland horse as an example to show ______.

A. it is smaller than the Clydesdale horse

B. horse used to have gentle personalities

C. some horses have better shaped than others

    D. horses were of less variety before domestication

3.Horses contributed to the spread of culture by ______.

A. carrying heavy loads

B. changing farming methods

C. serving as a means of transport

D. advancing agriculture in different areas

4.The passage is mainly about _______.

A. why humans domesticated horses

B. how humans and horses needed each other

C. why horses came in different shapes and sizes

D. how human societies and horses influenced each other

 

查看答案和解析>>

Domestic (驯养的) horses now pull ploughs, race in the Kentucky Derby, and carry police. But early horses weren’t tame (驯服的) enough to perform these kinds of tasks. Scientists think the first interactions humans had with horses were far different from those today.

Thousands of years ago, people killed the wild horses that lived around them for food. Over time, people began to catch the animals and raise them. This was the first step in domestication.

As people began to tame and ride horses, they chose to keep those animals that had more desirable characteristics. For example, people may have chosen to keep horses that had a gentle personality so they could be ridden more easily. People who used horses to pull heavy loads would have chosen to keep stronger animals. Characteristics like strength are partly controlled by the animals’ genes. So as the domesticated horses reproduced, they passed the characteristics on to their young. Each new generation of houses would show more of these chosen characteristics.

Modern day horse breeds come in a wide variety of shapes and sizes. This variety didn’t exist in the horse population before domestication. The Shetland horse is one of the smallest breeds—typically reaching only one meter tall. With short, strong legs, the animals were bred to pull coal out of mine shafts (矿井) with low ceilings. Huge horses like the Clydesdale came on the scene around 1700. People bred these heavy, tall horses to pull large vehicles used for carrying heavy loads.

The domestication of horses has had great effects on societies. For example, horse were important tools in the advancement of modern agriculture. Using them to pull ploughs and carry heavy loads allowed people to farm more efficiently. Before they were able to ride horses, humans had to cross land on foot. Riding horses allowed people to travel far greater distance in much less time. That encouraged populations living in different areas to interact with one another. The new from of rapid transportation helped cultures spread around the world.

1. Before domestication horses were ______.

A. caught for sports

B. hunted for food

C. made to pull ploughs

D. used to carry people

2. The author uses the Shetland horse as an example to show ______.

A. it is smaller than the Clydesdale horse

B. horse used to have gentle personalities

C. some horses have better shaped than others

D. horses were of less variety before domestication

3. Horses contributed to the spread of culture by ______.

A. carrying heavy loads

B. changing farming methods

C. serving as a means of transport

D. advancing agriculture in different areas

4. The passage is mainly about _______.

A. why humans domesticated horses

B. how humans and horses needed each other

C. why horses came in different shapes and sizes

D. how human societies and horses influenced each other

查看答案和解析>>


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