外研版（2019）选择性必修第二册《Unit 5 A delicate world》2021年同步练习卷（Using Language 专测作业）

一、单词拼写

• 1．At the current rate of decrease，many rain forest animals could become

  （绝种的） in less than 10 years.
  组卷：9引用：3难度：0.8

  解析

• 2．They are only doing what is necessary to prevent the destruction of

  （植物）.
  组卷：8引用：4难度：0.5

  解析

• 3．This substance will not

  （溶解）in water.
  组卷：3引用：2难度：0.5

  解析

• 4．Plants draw minerals and other

  （养分） from the soil.
  组卷：10引用：4难度：0.5

  解析

三、阅读理解

• 12．It is true that quite a few most respected scientific authorities have confirmed that the world is becoming hotter and hotter.There is also strong evidence that humans are contributing to the warming.Countless recent reports have proved the same thing.For instance，a 2012 summary about the climate science by the Royal Society noted that， "The global warming over the last half-century has been caused mainly by human activity."
     You may not believe that humans could change the planet's climate，but the basic science is well understood.Each year，billions of tons of greenhouse gases are released into the atmosphere because of human activity.As has been known for years，these gases hold heat that would otherwise escape to space，wrapping the planet in an invisible blanket.
     Of course，the earth's climate has always been changing due to "natural" factors（因素）such as volcanic eruption or changes in solar，or cycles concerning the Earth's going around the sun.According to the scientific research，however，the warming observed by now matches the pattern of warming we would expect from a build-up of greenhouse gas in the atmosphere—not the warming we would expect from other possible causes.
     Even if scientists did discover another reasonable explanation for the warming recorded so far，that would give birth to a difficult question.As Robert Henson puts it， "If some newly discovered factor is to blame for the climate change，then why aren't carbon dioxide and the other greenhouse gases producing the warming that basic physics tells us they should be？"
     The only way to prove with 100% certainty that humans are responsible for global warming would be to run an experiment with two identical Earths—one with human influence and one without That obviously isn't possible，and so most scientists are careful not to state human influence as an absolute certainty.
  
  （1）In most scientists' opinion，the global warming is mainly caused by

  .
  A．solar activities
  B．volcanic activities
  C．natural factors
  D．human factors
  （2）The passage is developed by

  .
  A．giving typical examples
  B．following the order of space
  C．analyzing a theory and arguing it
  D．comparing and finding differences
  （3）We can reasonably know from the passage that

  .
  A． "natural" factors also contribute to changes of earth's climate
  B．greenhouse gases also have some benefits to the earth
  C．there is another planet that is exactly the same as the earth
  D．increasing temperature cannot be proved with 100% certainty
  （4）Which of the following can be the best title？

  
  A．Are All the Scientists Really Scientific？
  B．Where Is Global Warming Leading Us to？
  C．Are Humans Definitely Causing Global Warming？
  D．What's Relation of Global Warming and Greenhouse Gases？
  组卷：12引用：2难度：0.7

  解析

四、语法填空

• 13．The polar bear is found in the Arctic Circle and some big land masses as far south as Newfoundland．While they are rare north of 88°，there is evidence（1）

  they range all the way across the Arctic，and as far south as James Bay in Canada．It is difficult to figure out a global population of polar bears as much of the range has been（2）

  （poor） studied；however，biologists calculate that there are about 20，000-25，000 polar bears worldwide．
     Modern methods（3）

  tracking polar bear populations have been employed only since the mid-1980s，and are expensive（4）

  （perform） consistently over a large area．In recent years some Inuit people in Nunayut（5）

  （report） increases in bear sightings around human settlements，leading to a（6）

  （believe） that populations are increasing．Scientists have responded by （7）

  （note） that hungry bears may be congregating（聚集） around human settlements，leading to the illusion（错觉） that populations are（8）

  （high） than they actually are．Of（9）

  nineteen recognized polar bear sub populations，three are declining，six（10）

  （be） stable，one is increasing，and nine lack enough data．
  组卷：1178引用：16难度：0.5

  解析