Pretoria, South Africa – Hundreds of swimmers play in the water along a South Africa beach. Suddenly a huge shark appears off shore and heads for the bathers. Before it can get close to the swimmers, the shark, for some mysterious reason, starts swimming parallel to the beach. Then it turns away from the shore and heads out to sea, leaving the swimmers untouched.
Such a scene will soon become common along shark-in-fasted (鯊魚成群的) shores. An electrical engineer from the University of Pretoria has developed an electrical system that repels (擊退) sharks by controlling their movements. Confused by this action, the sharks end up turning away from the beach.
In this unusual shark-repellent method, an insulated (絕緣的) cable is buried on the bottom of the sea around a beach where people swim. When an electric current is sent through the cable, an electric field is produced in the water above the cable.
When shark swims into the electric field, nerve cells just below the shark' s skin will sense the field. The electricity produces a reflex (反射作用) action in the shark' s muscles, causing the dangerous animal to swim parallel to the cable. Confused by increasing loss of control of its muscles, the shark suddenly changes its direction and heads seaward, away from the electric field.
In a test of the invisible new shark-repellent system, a cable was placed around a beach in St. Lucia, an island around the beach a long time ago to keep sharks away from swimmers, and a net was left in place during the experiment.
When the electric field was left on for more than a year and a half, no sharks were found in the net. However, when the power was turned off,89 sharks ended up in the net.
Using the electric-wall method instead of net to protect bathers would avoid the needless death of many sharks, said biologists. Currently, thousands of sharks die each year when they become trapped in protective nets that surround holiday resorts in Africa and Australia.  About 10 to 15 humans are killed by sharks annually.
1．Why doesn' t the shark attack the swimmers according to the passage?
A．Because there are so many swimmers in the water.
B．Because the shark isn’t so hungry as to eat the swimmers.
C．Because of some mysterious power from the heaven.
D．Because there is an invisible electric field confusing the shark.
2．An electrical engineer from the University of Pretoria has developed __      .
A．a(chǎn) protective net   
B．a(chǎn) new shark-repellent system
C．the electric field        
D．a(chǎn)n insulated cable
3．An electric field is produced in the water above the cable         .
A．only when a shark swims into the electric field
B．only when an insulated cable is buried on the bottom of the sea around a beach where people swim
C．only when an electric current is sent through the cable
D．only when the sharks are trapped in protective nets
4．Which of the following is NOT TRUE according to the passage?
A．Protective nets had been fixed earlier than the new shark-repellent system.
B．The new shark – repellent system will probably replace the protective nets.
C．Thousands of sharks have died each year since this new system was put into use.
D．Using the electric-wall instead of nets would avoid the needless death of many sharks.


【小題1】D
【小題2】B
【小題3】C
【小題4】C

解析

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科目：高中英語(yǔ) 來(lái)源：遼寧省寬甸縣20092010學(xué)年度高一下學(xué)期期末聯(lián)考試卷（英語(yǔ)） 題型：閱讀理解

Pretoria, South Africa – Hundreds of swimmers play in the water along a South Africa beach. Suddenly a huge shark appears off shore and heads for the bathers. Before it can get close to the swimmers, the shark, for some mysterious reason, starts swimming parallel to the beach. Then it turns away from the shore and heads out to sea, leaving the swimmers untouched.

Such a scene will soon become common along shark-in-fasted (鯊魚成群的) shores. An electrical engineer from the University of Pretoria has developed an electrical system that repels (擊退) sharks by controlling their movements. Confused by this action, the sharks end up turning away from the beach.

In this unusual shark-repellent method, an insulated (絕緣的) cable is buried on the bottom of the sea around a beach where people swim. When an electric current is sent through the cable, an electric field is produced in the water above the cable.

When shark swims into the electric field, nerve cells just below the shark' s skin will sense the field. The electricity produces a reflex (反射作用) action in the shark' s muscles, causing the dangerous animal to swim parallel to the cable. Confused by increasing loss of control of its muscles, the shark suddenly changes its direction and heads seaward, away from the electric field.

In a test of the invisible new shark-repellent system, a cable was placed around a beach in St. Lucia, an island around the beach a long time ago to keep sharks away from swimmers, and a net was left in place during the experiment.

When the electric field was left on for more than a year and a half, no sharks were found in the net. However, when the power was turned off,89 sharks ended up in the net.

Using the electric-wall method instead of net to protect bathers would avoid the needless death of many sharks, said biologists. Currently, thousands of sharks die each year when they become trapped in protective nets that surround holiday resorts in Africa and Australia.  About 10 to 15 humans are killed by sharks annually.

1．Why doesn' t the shark attack the swimmers according to the passage?

A．Because there are so many swimmers in the water.

B．Because the shark isn’t so hungry as to eat the swimmers.

C．Because of some mysterious power from the heaven.

D．Because there is an invisible electric field confusing the shark.

2．An electrical engineer from the University of Pretoria has developed __      .

A．a(chǎn) protective net   

B．a(chǎn) new shark-repellent system

C．the electric field        

D．a(chǎn)n insulated cable

3．An electric field is produced in the water above the cable         .

A．only when a shark swims into the electric field

B．only when an insulated cable is buried on the bottom of the sea around a beach where people swim

C．only when an electric current is sent through the cable

D．only when the sharks are trapped in protective nets

4．Which of the following is NOT TRUE according to the passage?

A．Protective nets had been fixed earlier than the new shark-repellent system.

B．The new shark – repellent system will probably replace the protective nets.

C．Thousands of sharks have died each year since this new system was put into use.

D．Using the electric-wall instead of nets would avoid the needless death of many sharks.

 

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科目：高中英語(yǔ) 來(lái)源：安徽省皖南八校2009屆高三第二次聯(lián)考 題型：閱讀理解

 

Pretoria．South Africa—Hundreds 0f swimmers Play in the water along a South African beach．Suddenly a huge shark appears offshore and heads for the bathers．Before it can get close to the swimmers，the shark，for some mysterious reason，starts swimming parallel to the beach．Then it turns away from shore and heads out to sea，leaving the swimmers untouched．

Such a scene will soon become common along shark infested（鯊魚出沒）shores．An electrical engineer from the University of Pretoria has developed an electrical system that repels（擊退）sharks by controlling their movements．Confused by this action，the sharks end up turning away from the beach．

In this unusual shark repellent method，an insulated（絕緣）cable is buried on the bottom of the sea around a beach from which people swim．When an electric current is sent though the cable，an electric field is produced in the water above the cable．

When the shark swims into the electric field，nerve cells just below the shark’s skin detect the field．The electricity produces a reflex（反射）action in the shark’s muscles，causing the dangerous animal with sharp teeth to swim parallel to the cable．Contused by increasing loss of control of its muscles，the shark suddenly changes its direction and heads seaward，away from the electric field．   

In a test of the invisible new shark-repellent system，a cable was placed around a beach in St．Lucia an island in the tropics．A protective net，which had been installed around the beach a long time ago to keep sharks from swimmers，was left in place during the experiment．

When the electric field was 1eft on for more than a year and a half，no sharks were found in the nets．However,when the power was turned off，89 sharks ended up in the nets．

Using the electric wall method instead of nets to protect bathers would avoid the needless death of many sharks，say biologists．Currently，thousands of sharks die each year when they become trapped in protective nets that surround holiday resorts in Africa and Australia．About 10 to 15 humans are killed by sharks annually．

1.In the first passage，why doesn’t the shark attack the swimmers？

A．Because they are many swimmers in the water．

B．Because the shark doesn’t want to eat the swimmers。

C．Because of some mysterious reason from the God．

D．Because there is an invisible electric field confusing the shark．

2.An electrical engineer from the University of Pretoria has developed         ．

A．A protective net                     B．A new shark-repellent system

C．The electric field                       D．An insulated cable

3.An electric field is produced in the water above the cable          ．

A．only when the shark swims into the electric field

B．a(chǎn)n insulated cable is buried on the bottom of the sea around a beach from which people

swim

C．only when an electric current is sent though the cable

D．only when the sharks are trapped in protective nets

4.Which of the following is NOT TRUE according to the passage?

A．Protective nets had been installed around the beach earlier than the new shark repellent system．

B．This new kind of shark repellent system wilt take place of the protective nets．

C．Thousands of sharks die and about 10 to 15 humans are killed by sharks each year in Africa and Australia since this new system was Put into use．

D．Using the electric wall method instead of nets to protect bathers would avoid the needless death of many sharks．

 

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Pretoria, South Africa – Hundreds of swimmers play in the water along a South Africa beach. Suddenly a huge shark appears off shore and heads for the bathers. Before it can get close to the swimmers, the shark, for some mysterious reason, starts swimming parallel to the beach. Then it turns away from the shore and heads out to sea, leaving the swimmers untouched.

Such a scene will soon become common along shark-in-fasted (鯊魚成群的) shores. An electrical engineer from the University of Pretoria has developed an electrical system that repels (擊退) sharks by controlling their movements. Confused by this action, the sharks end up turning away from the beach.

In this unusual shark-repellent method, an insulated (絕緣的) cable is buried on the bottom of the sea around a beach where people swim. When an electric current is sent through the cable, an electric field is produced in the water above the cable.

When shark swims into the electric field, nerve cells just below the shark' s skin will sense the field. The electricity produces a reflex (反射作用) action in the shark' s muscles, causing the dangerous animal to swim parallel to the cable. Confused by increasing loss of control of its muscles, the shark suddenly changes its direction and heads seaward, away from the electric field.

     In a test of the invisible new shark-repellent system, a cable was placed around a beach in St. Lucia, an island around the beach a long time ago to keep sharks away from swimmers, and a net was left in place during the experiment.

     When the electric field was left on for more than a year and a half, no sharks were found in the net. However, when the power was turned off,89 sharks ended up in the net.

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1．Why doesn' t the shark attack the swimmers according to the passage?

    A．Because there are so many swimmers in the water.

    B．Because the shark isn’t so hungry as to eat the swimmers.

    C．Because of some mysterious power from the heaven.

    D．Because there is an invisible electric field confusing the shark.

2．An electrical engineer from the University of Pretoria has developed __      .

    A．a(chǎn) protective net    

       B．a(chǎn) new shark-repellent system

    C．the electric field         

       D．a(chǎn)n insulated cable

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    B．only when an insulated cable is buried on the bottom of the sea around a beach where people swim

    C．only when an electric current is sent through the cable

    D．only when the sharks are trapped in protective nets

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    A．Protective nets had been fixed earlier than the new shark-repellent system.

     B．The new shark – repellent system will probably replace the protective nets.

     C．Thousands of sharks have died each year since this new system was put into use.

     D．Using the electric-wall instead of nets would avoid the needless death of many sharks.

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