Do you know something about tree rings?
Do you know they can tell us what the weather was like, sometimes even hundreds
of years ago? We can see the change of weather by studying the
tree rings. For example, to find out the weather of ten years
ago, count (数) the rings of a tree from outside to the inside. If the tenth ring
is far from the eleventh ring, then we are sure that it was sunny most of that
year. If it is near to the eleventh ring, then the weather that year was
bad. Tree rings are important not only for studying the history
(历史) of weather but also for studying the history of man. Many centuries ago
there lived a lot of people at a place in New Mexico. But now you can find only
sand there? A scientist studied the rings of dead trees there. He found that the
people had to leave because they had cut down all trees to make fires and
buildings. As all trees had gone, the people there had to
move.
单选题
What is not true? [A] People can know the weather hundreds of years ago by studying the tree ring. [B] People can study the history of man from tree rings. [C] People can know what animals had once lived from tree rings.
单选题
Which two rings show the weather 12 years ago? [A] The eleventh and twelfth ring from outside to inside. [B] The eleventh and twelfth rings from inside to outside. [C] The twelfth and thirteenth rings from outside to inside.
单选题
What happened to those people who had once lived in New Mexico? [A] They are still living there. [B] They had all died because the trees there had died. [C] They moved to other places because all the trees were cut down.