“A species tends to grow bigger when it reaches the peak of its population , but becomes smaller when numbers decline,” he said.
The dental remains of the skull, which is the oldest giant panda skull ever found, are similar to today’s pandas, indicating the type of teeth that could munch (津津有味地嚼)mountains of bamboo. A panda can eat up to 40kg of bamboo per day.
Paleoanthropologist Russell Ciochon, the US co-author at the University of lowa, said the panda’s focus on bamboo could have helped it survive all these years.
“Once an animal begins to rely on a common and stable food source, such as bamboo, it tends to evolve a larger body size,” he said. “As individuals of the evolving species grow bigger, they have a better chance not to be eaten by predators (肉食动物) due to their larger body size.”
1. According to the research of the CAS , there were most pandas in the world
.
A. 2 million years ago
B. between 2.4 and 2 million years ago
C. 500,000 years ago
D. Nowadays
答案解析:答案为C。本题为细节题。第四段提到了CAS,接下来一段提到 “Researchers knew the panda reached its maximum size about 500,000 years ago, when it peaked ...”可知熊猫的体型最大的时候也是数量达到顶峰的时候是在500,000 年以前。故答案为C。
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