人教版（2019）必修第一冊(cè)《Unit 4 Natural Disasters Section B》2021年同步練習(xí)卷

Ⅰ.單句語(yǔ)法填空

• 1．When the runners got to the finishing line，all of them were quite out of

  （breathe）．
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• 2．Their inventions have contributed to the development of

  （electricity） engineering．
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• 3．Ignoring the danger，he rushed into fire to rescue those

  （trap） in the house．
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• 4．It is well known that ancient Greece was a fountain of

  （wise） and philosophy．
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• 5．When I finally got to the meeting room，the discussion had already come to

  end．
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• 6．Nearly two

  （three） of the students in our class like playing football．
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Ⅳ.閱讀理解

• 17．Parts of Africa are covered by a dark cloud.But this is no rain cloud.It is a living cloud made of billions of locusts （蝗蟲） that are travelling across the continent eating everything in their path.
     And now in the battle to stop this disaster，a radio station in Senegal，West Africa，is offering listeners 50 kilograms of rice if they can catch and kill 50 kilograms of locusts."We think this idea will get more people to take part in the war on the locusts，" said Abdoulaye Ba，from Sud-Fm，a radio station in one of Senegal's worst affected area.
     This is West Africa's biggest locust disaster in 15 years，and it is moving east，causing huge damage to crops.As they move they produce young and increase their number and will soon threaten Sudan in the northeast of Africa.Some say it could reach Asia.Experts say the harmful effect on crops in areas already suffering from food shortage and war could cause many people to go hungry.Governments in the areas are not well equipped to fight the pest.
     Although leaders of 12 countries have agreed on a plan，it is not expected to be enough."We are now treating 6，000 hectares （公頃） per day with pesticide （殺蟲劑），but we need to treat 20，000 hectares per day in order to have any hope of controlling this disaster，" said Mohamed Abdallahi Ould Babah，director of locust control in Mauritania.
     Requests are being made for international aid，which is the only way to limit the disaster，the UN's Food and Agriculture Organization warned.
  
  （1）By using "dark cloud" to describe locusts in the first paragraph，the author of the article

  .
  A．shows the size and speed of the mass of locusts
  B．suggests the great damage that locusts can cause
  C．warns that locusts would sweep the continent like rain clouds
  D．both A and B
  （2）The story is mainly about

  .
  A．West Africa's united effort in fighting a disaster
  B．the difficulty in controlling locusts
  C．how locusts caused great damage to West Africa
  D．a(chǎn) struggle to fight against a disaster brought by locusts in West Africa
  （3）The locust disaster

  .
  A．would be even more serious in Asia
  B．is out of control
  C．a(chǎn)ffected only the warning areas
  D．cannot be stopped unless twice as much pesticide is provided for the affected areas
  （4）Which of the following is WRONG？

  
  A．Sud-Fm offers a reward for fighting locusts so that more people will join in the effort.
  B．Senegal is to the southwest of Sudan.
  C．The locusts can cause such damage mainly because it has no natural enemy in West Africa.
  D．12 countries affected by locusts have united but still lack pesticide.
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Ⅴ.七選五

• 18．A volcano is a geological landform usually caused by the eruption through a vent（火山口） in a planet's surface of magma（巖漿），molten rock welling up from the planet's interior.（1）

  
     A popular way of judging volcanoes goes by their frequency（頻率） of eruption.（2）

  Those that have erupted in historical times but are now quiet called dormant（休眠的） and those that have not erupted in historical times called extinct.
     （3）

  The lifespan of a volcano can vary from months to several million years，making such a distinction（辨別） sometimes meaningless when compared to the lifespans of humans or even civilisations.For example，many of the earth's volcanoes have erupted dozens of times in the past few thousand years but are not currently showing signs of eruption.Given the long lifespan of such volcanoes，they are very active.（4）

  
     Scientists usually consider a volcano active if it is currently erupting or showing signs of unrest，such as unusual earthquake activity or significant new gas emissions.（5）

  It is important to note that the span of recorded history differs from region to region.In the Mediterranean，recorded history reaches back more than 3，000 years but in the Pacific Northwest of the United States，it reaches back less than 300 years，and in Hawaii，little more than 200 years.The Smithsonian Global Volcanism programme's definition of "active" is having erupted within the last 10，000 years.
  
  A.By our lifespans，however，they are not.
  B.Those that erupt regularly called active.
  C.One way of classifying volcanoes is by the type of material erupted.
  D.Obviously，such eruptions tend to be destructive mainly in one direction.
  E.Many scientists also consider a volcano active if it has erupted in historic time.
  F.There is no real agreement among volcanologists on how to define an "active" volcano.
  G.Volcanoes of various types are found on other planets and their moons as well as on the earth.
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