What's causing global warming？Is it a man-made disaster（災(zāi)難）？Or are temperatures simply changing naturally？Whatever the case is，we can at least try to slow things down.But how？
   The Nicodemus Wilderness Project suggests that we should plant trees.If the Earth has more trees，greenhouse gases will be reduced.Trees also cut down on water pollution，and provide habitats for wildlife to live in.What's more，they improve human health by producing oxygen（氧氣） and improving air quality.In fact，if we plant one tree，just one，it will have lots of benefits for our planet.A tree not only takes in a lot of harmful greenhouse gases over its lifetime，but also produces much oxygen for people.And it provides the cooling effect like an air conditioner does.
   In fact，lots of people have already done so.Tree planting is becoming more and more popular as a way to take part in protecting the environment.The Canopy Project planted one million trees in 2010 as part of the AVATAR Home Tree Initiative.In total，trees were planted in 16 countries.In Belgium，the Organization for Forests worked with private land owners to help them plant trees.In Germany，a young man named Felix Finkbeiner has been leading a global movement to plant more trees.He was nine when he came up with the idea of planting trees around the world.And，what can you do to help？Well，you could go to your local garden center and buy a tree，although you'd need to get advice on how to look after it properly so that it can survive（生存）.Besides，you can join a tree planting project.

（1）According to Paragraph 2，a tree can

D

D

.
A．cut down on light pollution
B．take in a lot of oxygen
C．provide the cooling effect
D．produce many greenhouse gases
（2）The underlined word "habitats" in the second paragraph means

C

C

.
A．fruits
B．a(chǎn)ir
C．places
D．water
（3）From the passage，we know Felix Finkbeiner

D

D

.
A．has helped many private land owners to plant trees
B．is the leader of the Canopy Project
C．has the dream to plant trees only in his country
D．has been working hard to protect the environment
（4）The writer shows some examples in the last paragraph to

A

A

.
A．call on more people to plant trees
B．show how popular it is to plant trees
C．a(chǎn)sk people to give away money to the projects
D．tell people a lot of trees have been planted
（5）Which can be the best title for this passage？

C

C

A．Cutting Down Trees Causes Global Warming
B．Harmful Greenhouse Gases
C．Planting Trees Betters the Environment
D．Setting Up Projects Becomes Popular