B．scientists study tree rings

　　C．trees that lived hundreds of years ago

　　D．the ponderosa pine in the southwest

　　解析　推理判断题。本文主要讲述了树的年轮和科学家对它的研究。

　　答案　B

　　46．Why do the scientists study the width of the tree rings?

　　A．They want to know how big the tree will grow.

　　B．Scientists want to move the pine trees.

　　C．The trees depend on rainfall for water.

　　D．The rings tell them how much rain has fallen.

　　解析　推理判断题。见全文最后一句。

　　答案　D

　　D

　　Hidden in our subconsciousness(潜意识) is a perfect mental picture.We see ourselves on a long trip that goes across the continent.We are traveling by train.Out of the windows，we think in the passing scene of cars on nearby highways，of children waving at a crossing，of cattle feeding on a distant hillside，of smoke pouring from a power plant，or row upon row of corn and wheat，of flat lands and valleys，of mountains and rolling hills，of city skylines and village halls.

　　But uppermost in our minds is the final destination.On a certain day at a certain hour，we will pull into the station.Bands will be playing and flags waving.Once we get there，so many wonderful dreams will come true and the pieces of our lives will fit together like a completed jigsaw(拼图玩具) puzzle.How restlessly we pace the aisles(通道)，condemning the minutes for loitering—waiting，waiting，waiting for the station.

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