Some popular places to visit are built by people. Other famous places are created by nature. For e  1   , in the northeast of the United States, there was a famous rock on a high mountain that l  2   just like an old man. He had lots of hair, a big nose and a beard．People c  3   him “The Old Man of the Mountain” and every year more than a m  4   people came to look at him. Scientists think that the stone face had been there for about 17,000 years. 

   In May 2003, there was very bad w  5   near the Old Man of the Mountain. There were

very high winds and the temperature was very cold. The sky was so c  6   that people couldn’t see the stone face for many days. As soon as the storm was o  7   , people looked for the Old Man and they couldn’t see him. They discovered t  8   he had fallen apart. The stones that made his face sank down the mountain. A number of scientists climbed up to see i  9   they could repair the stone face, but they had to g  10   up. They figured out（断定）that the damage from the weather was just too bad．

    Can animals be made to work for people ? Some scientists think that one day animals may be trained （训练） to do a number of simple jobs i     (1) of people . They say that at a circus （杂技场）， for example , we may see elephants , monkeys , dogs and other animals doing q     (2) skillful （熟练的） things . Perhaps you have seen them on the television or in a film . If you watch closely , you may find that the trainer （驯兽员） always g     (3) the animal some sugar

o    (4) a piece of fruit as a reward （报酬） . The scientists say that many d    (5) animals may be trained to do a lot of simple things if they know they will get a reward f    (6) doing that .

    Of course , as we know , dogs can be trained to look after a house  , and soldiers in both old and modern t     (7) have u    (8) geese to give warning （警报） by m    (9) a lot of noise when an enemy comes near . And also it may be possible to train animals to work in families or

f    (10) .