一、信息还原
阅读短文，从方框中选出能填入空格处的最佳选项，有一个多余选项。
Alaska is the biggest of all the 50 US states. Over the past 60 years, Alaska has been about 3°F (about 1.7°C) warmer.
E
1
This changes ecosystems. Alaska will get warmer. It will also have more rain and snow. Climate change is affecting (影响) many people, animals and ecosystems.
Permafrost (永久冻土) is frozen soil which lies a few feet under the ground. Permafrost usually stays frozen all year.
B
2
Some part of it is melting, though. As it melts, it gets softer. The ground above can fall down.
D
3
In Alaska, there are many roads and buildings on top of it. As it melts, they will also get damaged. It will cost a lot of money to fix them.
Lakes in Alaska are also changing because of climate change. Some get bigger.
A
4
Millions of birds travel to these lakes when it’s warm. Alaska’s local people hunt and fish for food there too.
Warmer, drier weather makes wildfires more frequent.
F
5
Fires change the forest. More insects come and harm the forest. That means more dead trees. And then, dead trees catch fire easily.
A. Others get smaller.
B. Most of Alaska has permafrost.
C. It is very hard to move to safer areas.
D. This can cause damage to whatever is built on top of it.
E. That is more than twice as much as the rest of the United States.
F. Large wildfires have destroyed more forests in Alaska in recent recorded decades.
1.
E
2.
B
3.
D
4.
A
5.
F
