a tourist was visiting new mexico and was amazed at the dinosaur bones lying about.
"how old are these bones?" the tourist asked an elderly native american, who served as a guide.
"exactly one hundred million and three years old.
"how can you be so sure?" inquired the tourist.
"well," replied the guide, " a geologist came by here and told me these bones were one hundred million years old, and that was exactly three years ago.
notes:
(1) new mexico 新墨西哥（美国州名）
(2) be amazed at 对…感到惊诧
(3) dinosaur n.恐龙（已绝迹的巨大爬行动物）
exercises:
根据短文判断下列句子正（t）、（f）：
① the tourist was frightened by the dinosaur bones lying about.
② the elderly native american served as a guide.
③ the guide knew exactly how old the bones were.
④ the guide told the tourist the history of the bones.
。