in 1836, a small book was published in the united states and has hence been called the

Flying over a desert area in an arplane,two stentists loked down with traned eyes at tees and bushesAtler an

hour's fightone of the scientists wrote in his boo,"look here for probable metal"Scientists in another

airplane,flying over a mountain area,sent a message to other scientists on the ground,"Gold possible."Walking

across hilly Qound,four scientists reported," This ground should be searched for metal"From an airplane over a

hilly wasteland a scientistsent back by radio one word:"Uranium."

None of the scientists had X ray eyes:they had no magic power of looking down below the earth's surface.They

were merely putting to use one of the newest methods of locating minerals in the groun..trees and plants as

signs that certain minerals may lie beneath the ground on whichthe trees and plants are growing.

This newest method of searching for minerals is based on the fact that minerals deep in the earth may affect the

kind of bushes and trees that grow in the surface.

At Watson Bar Greek,a brook(小溪)six thousand feet high in the mountains of British Columbia,Canada,a mineral

search group gathered bags of tree seeds.Boxes were flled with small branches from the trees.Roots were dug

and put into boxes.Each bag and box was carefully marked.In a scientific laboratory,the parts of the forest trees

were burned to ashes and tested.Each small part was examined to learn whether there were minerals in it.

Study of the roots,branches,and seeds showed no silver.But there were small amounts of gold in the roots and a

itte less gold in the branches and seeds,The seeds growing nearest to the tree trunks had more gold than those

growing on the ends of the branches,

1.Which of the fllowving is NOT mentioned as part of a tree that can help find minerals?（）

A.Branches

B.Seeds

C.Roos

D.Leaves

2.Scientists were flying over a desert or a hilly wasteland ora mountain area in order to sea ground.（）

A.silver

B.gold

C.minerals

D.uranium

3.The scientists were searching for minerals by using（）.

A.X-ray

B.magic power

C.a special instrument

D.trained eyes

4.The study of trees,branches and roots shows that（）.

A.there were larger amounts of gold in the branches than in the seeds

B.there were smaller amounts of gold in the roots than in the branches

C.there were less amounts ofgold in the seeds growing on the ends of branches than

D.nearest to the tree trunksD.there was more gold in the branches than in the roots

5.Which is the best title suggested below?（）

A.Scientists Searching for Metals with Special Power

B.New Methods of Searching for Minerals

C.A New Method of Searching for Minerals--Using Trees and Plants

D.Gold Could Be Found by Trees and Plants

帕萨特的车型尺寸（）

（)年托耐特以层压板做成第一把椅子。

最早的水泥立窑出现在（）年

In 1836, Whitman published his first book, Nature, which met with a wild reception.（)

挖掘机诞生于（）年

（)年Cassaigness首先提出硬化剂注射疗法。

GLB200动感型的车身尺寸是（）