49. What do we learn about low-income parents regarding school field trips?
A) They want their children to participate even though they don't see much benefit.
B) They don't want their kids to participate but find it hard to keep them from going.
C) They don't want their kids to miss any chance to broaden their horizons despite the cost.
D) They want their children to experience adventures but they don't want them to run risks.
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50. What is the author's expectation of schools?
A) Bringing a community together with ingenuity.
B) Resolving the existing discrepancies in society.
C) Avoiding creating new gaps among students.
D) Giving poor students preferential treatment.
51. What will happen by 2100, according to a new study?
A) King penguins in the Antarctic will be on the verge of dying out.
B) Sea water will rise to a much higher level around the Antarctic.
C) The melting ice cover will destroy the great Antarctic wilderness.
D) The pristine waters around the Antarctic will disappear forever.
52. What do we learn from the findings of a separate study?
A) Shrinking krill population and rising temperatures could force Antarctic whales to migrate.
B) Human activities have accelerated climate change in the Antarctic region in recent years.
C) Industrial fishing and climate change could be fatal to certain Antarctic species.
D) Krill fishing in the Antarctic has worsened the pollution of the pristine waters.
53. What does the passage say about king penguins?
A) They will turn out to be the second-largest species of birds to become extinct.
B) Many of them will have to migrate to isolated islands in the Southern Ocean.
C) They feed primarily on only a few kinds of krill in the Antarctic Polar Front.
D) The majority of them may have to find new breeding grounds in the future.
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