Questions 31-37 Complete the summary below. Choose NO MORE THAN TWO WORDS from the passage for each answer. Write your answers in boxes 31-37 on your answer sheet
原文
It's been a long time coming. People first started harnessing the sea's power at least as long ago as AD900, with water mills placed over tidal rivers to grind cereals into flour.
The first river-based scheme centred on building a barrage across the river mouth to trap a head of water at high tide, letting it escape through turbines in order to drive generators. In the mid-1960s, one such scheme began operation in Brittany in northern France and still supplies most of the region's electricity. Another has been proposed for Canada’s Bay of Fundy, which has the largest tidal range in the world. But barrages have been found to cause serious environmental problems. They prevent fish migration and ruin sensitive habitats, which are located between low and high tide lines. This isn't the only drawback. The building of an 8,640-megawatt scheme — enough to supply electricity to more than 8 million homes in the UK — has been proposed for the Severn Estuary, which has the world's second highest tidal range. But the plan is on the shelf, pan because the estuary route is one of the main outlets for human waste from central England and Wales. Plugging it could thus produce the world's most disgusting body of water.
Tidal power
第 31 题
One tidal power scheme involves the construction of a _____ This is usually sited at the ____ of a large tidal river. The aim is to capture the large volume of water that arrives during ____ The water then passes through a series of ____.., providing the power to produce electricity.
正确答案：barrage
第 32 题
One tidal power scheme involves the construction of a ____ This is usually sited at the _____ of a large tidal river. The aim is to capture the large volume of water that arrives during ____ The water then passes through a series of ____.., providing the power to produce electricity.
正确答案：mouth
第 33 题
One tidal power scheme involves the construction of a ____ This is usually sited at the ____ of a large tidal river. The aim is to capture the large volume of water that arrives during _____ The water then passes through a series of ____.., providing the power to produce electricity.
正确答案：high tide
第 34 题
One tidal power scheme involves the construction of a ____ This is usually sited at the ____ of a large tidal river. The aim is to capture the large volume of water that arrives during ____ The water then passes through a series of _____.., providing the power to produce electricity.
正确答案：turbines
第 35 题
However, a number of damaging ecological side effects can occur with this system. For example, _____ which travel up and down the river are prevented from doing so. Also, ____ that exist on the area of the river bed that separates the tide lines are often destroyed during construction. Finally, human ____ which is normally carried down by the river and dispersed in the oceans can be trapped, creating serious problems.
正确答案：fish
第 36 题
However, a number of damaging ecological side effects can occur with this system. For example, ____ which travel up and down the river are prevented from doing so. Also, _____ that exist on the area of the river bed that separates the tide lines are often destroyed during construction. Finally, human ____ which is normally carried down by the river and dispersed in the oceans can be trapped, creating serious problems.
正确答案：(sensitive) habitats
第 37 题
However, a number of damaging ecological side effects can occur with this system. For example, ____ which travel up and down the river are prevented from doing so. Also, ____ that exist on the area of the river bed that separates the tide lines are often destroyed during construction. Finally, human _____ which is normally carried down by the river and dispersed in the oceans can be trapped, creating serious problems.