Trees in the Amazon rainforest are showing scientists the past in order to help them predict the future.

Have you heard about tree rings ? Some trees create rings every year ________they grow. These rings can be ______in the tree trunks when the trees are cut down .Counting tree ______can tell us how old the tree is , but UK scientists have ________a way of learning about the climate of the rainforest in the past from the tree rings .

Growing in the Amazon rainforest, some trees only have short roots. This means that the trees depend on rain water, _______ the water that naturally occurs deeper underground . Therefore, the rings of tree trunks(樹干) can _______the rainfall in the forest in the past.

The rings can help us understand the rainfall, _______the climate of the Amazon forest over the last 100 years .What scientist want to know, however, is how the rainforest will be affected by the world’s rising temperatures. Will it _______wetter or drier? The Amazon rainforest is known as the “l(fā)ung（肺） of the earth ” for the amount of CO2 _______the trees take in from the air every day. A warming world could have a very bad effect on this important forest, but with more information about the ______ , scientists hope to know what one of the most important rainforests in the world will be like in the future .

1.A. as B. since C. although D. after

2.A. heard B. drawn C. produced D. seen

3.A. rings B. leaves C. fruits D. roots

4.A. changed B. forgotten C. discovered D. imagined

5.A. rather than B. as for C. because of D. thanks to

6.A. influence B. cause C. increase D. show

7.A. yet B. ever C. even D. still

8.A. taste B. smell C. sound D. become

9.A. when B. that C. where D. why

10.A. humans B. animals C. past D. future

1.A 2.D 3.A 4.C 5.A 6.D 7.C 8.D 9.B 10.C 【解析】本文講的是亞馬遜雨林中的樹木的年輪可能會揭露雨林過去的氣候狀況，科學家想借此預(yù)測未來的雨林變化。 1.句意：許多樹木當它們生長的時候每年都產(chǎn)生年輪。A.當…B.自從C.雖然D.在…之后，as引導時間狀語從句表示“當…時”，長年輪和生長是同時發(fā)生...
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