20 17 12 college English reading comprehension questions and answers

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When the plane flew over the desert area, two scientists looked down at the trees and bushes with trained eyes. After an hour's flight, one of the scientists wrote in his book, "Look for possible metals here." Scientists on another plane flew over the mountains and sent a message to other scientists on the ground, "There may be gold." Walking through the hilly area, four scientists reported that "we should look for metals in this land." A scientist radioed back a word "uranium" from a plane flying over the hilly wasteland.

No scientist has X-ray eyes: they don't have the magic to look down at the surface of the earth. They are just using a new method to locate minerals underground-using trees and plants as signs that some minerals may exist underground where trees and plants grow.

This latest method of finding minerals is based on the fact that minerals deep in the earth may affect shrubs and trees growing on the surface.

On a 6,000-foot stream in the mountains of British Columbia, Canada, a mineral exploration team collected bags of tree seeds. The box is full of twigs on the tree. The roots were dug out and put in the box. Every bag and box is carefully marked. In a scientific laboratory, some forest trees were burned to ashes and tested. Every small part is examined to see if there are any minerals in it.

Studies of roots, branches and seeds show that there is no silver. But there is a small amount of gold in roots, and there is even less gold in branches and seeds. The seed closest to the trunk has higher gold content than the seed growing at the end of the branch.

If the trees didn't show that there was gold underground, scientists wouldn't spend money to dig deeper. They dug a little and found more folds below. They dug deeper. They found a lot of gold.

1. Scientists are flying over deserts, hilly wasteland or mountainous areas in order to find _ _ _ _ _ _ _ underground.

A. golden

B. silver

C. metals

D. minerals

2. The study of trees, branches and roots shows that _ _ _ _ _ _ _.

A.there is more gold in the branches than in the seeds.

B.the content of gold in roots is less than that in branches.

C. The seeds that grow closest to the trunk contain more gold than the seeds that grow at the ends of branches.

D. There is more gold in the branches than in the roots.

3. Which title is the best?

A. Scientists look for metals with special abilities