A
The world is getting hotter, and there are more and more extreme(极端的) weather events because of climate change. 1. Even though Africa only produces a few greenhouse gases that leads to climate change, it's getting hurt a lot. Countries across Africa are paying a heavy price for the top polluters in other parts of the world.
2. They're grasslands, deserts, and wetlands. There's also a big rainforest called the Congo Basin. 3. But now, because of climate change, all these ecosystems are in trouble.
4. You can't find them anywhere else in the world. But because of the changing climate, these animals and plants might disappear(消失).
It's hard to deal with these problems because it will cost a lot of money. 5. People are working on a big project called the Great Green Wall to stop deserts from getting bigger, and they are doing better than expected.
A. But there's some good news. B. Africa has special ecosystems.
C. They help stop a lot of pollution. D. Africa is more than just a natural zoo.
E. Africa is home to lots of special animals and plants.
F. This causes a lot of problems for the countries in Africa.

1.F 2.B 3.C 4.E 5.A

B
Every year, millions of birds are killed or hurt when they fly into buildings. Why does this happen? 1. ____Birds sometimes fly into tall buildings that are all covered by glass.
Many birds fly from one place to another. Most of the time, they live in the wild, such as forests and wetlands. 2. ____They might see small trees and flowers inside a building and want to rest on these plants. The birds do not know there is glass between them and the plants. 3. ____
Some birds fly at night. They use the moon and stars to help guide them in the right direction. Tall buildings with lights on at night can confuse them. 4. ____The birds see the light, but they cannot tell that the light is coming from the lights inside a building. They fly toward the light and crash into a building. In the morning, there might be several dead birds lying on the ground.
5. ____Many office buildings now turn off their lights at night. This helps reduce the number of birds that fly into buildings and it also helps save energy.
A. The answer is glass. B. People are trying to solve the problem.
C. These birds have no idea what glass is. D. As a result, they fly right into the glass.
E. People don't know how to deal with the problem.
F. This is a big problem, especially on foggy and rainy nights.

1.A 2.C 3.D 4.F 5.B

C
Life is filled with regrets(遗憾). Anyone around you will have no difficulty in telling you his or her regrets. 1. ____What can you do to avoid future regrets?
Make better plans. If you start to do something, you need to make a plan before doing it. The earlier, the better. You will know what comes first and what comes last. 2. ____When changes happen, you can have more time to deal with them.
3. ____You can go around more often. More outdoor activities can keep you relaxed and active. You also need to be kind. "Thank you" can bring a smile to someone's face. Learn to say "sorry" and don't be angry with others.
Find the right friend. A friend may make your life better, but he or she can break your life as well. 4. ____Good friends will always make your ideas better. When you get into trouble, ask others for help. That little help may get you good results.
Never fear failure. Everybody fails. Even the greatest person fails. You should not fear failure because failure is not the end of the road. 5. ____
A. Live a more active life.
B. Keep yourself away from your friend.
C. So you need to think twice when you choose a friend.
D. You'll also know what you should do and what you shouldn't do.
E. As you get older, you look back and wish that you had made better choices.
F. People must take failure as a chance to learn something and improve themselves.

1.E 2.D 3.A 4.C 5.F