三、阅读理解
According to a study,the population of polar bears will drop seriously by the year:2080.The cause is melting sea ice.Without ice,the bears must walk on the bank which is away from their main food source.That means the animals will be in danger because of lacking food.
“ There's not enough food on land to support a polar bear population,” Doctor Smith,the study's lead writer said.Lack of food induces another problem.Mother bears may not be fat enough to produce milk for their babies.Some bear populations could stop having babies,leading to a rapid drop in numbers.
Arctic(北极的)sea ice usually melts in spring and summer,and then grows in winter.But now,the ice is taking longer to grow back.Weather reports say the Arctic is warming twice as fast as the rest of the planet.Ice here has reduced by 13% every 10 years since the 1970 s.The Arctic is home to about 26,000 polar bears.Scientists have known that the animals are in danger.
But the study also notes that it is still possible to slow down Arctic melting.The world can reduce the burning of fossil fuels(化石燃料)and greenhouse gas emissions (排放).“ Saving the polar bears is up to us.I believe that there is hope.But humans need to act quickly to turn that hope into a reality," Doctor Smith said.
(
D
)1.Where is this passage most probably from?
A.A cookbook. B.A storybook.
C.An art magazine. D.A science magazine.
(
C
)2.Why will polar bear populations drop seriously by 2080?
A.Because of greenhouse gas emissions.
B.Because of the burning of fossil fuels.
C.The sea ice in the Arctic is melting.
D.Mother bears stop having babies.
(
A
)3.What does the underlined word “ induces " in paragraph 2 mean?
A.Causes. B.Prints. C.Reaches. D.Shuts.
(
C
)4.Where is the polar bears' home according to paragraph 3?
A.In the South Pole. B.In the sea.
C.In the North Pole. D.On the earth.
