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9.______________________________ for the job，the manager felt a stone on his mind. (mind)

因心中沒有合適人選去做那份工作，經理心情非常沉重。

9. Having nobody in mind / As he had nobody in mind 考查have sb. in mind結構和分詞作原因狀語的用法。have sb. in mind心中有人選„若原因狀語從句的主語與主句主語相同，該從句可以簡化為現(xiàn)在分詞結構。類似結構還有時間狀語、條件狀語、讓步狀語等。

題目來源：高考丟分題英語 > Unit 3 Travel journal

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Pretoria, South Africa. Hundreds of swimmers are playing 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 the 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. Confixsed 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 from which people swim. When an electric current is sent through 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. 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 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 left 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.

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.

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

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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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