2. The underlined word “variation” in para 6 means
.
A. fall
B. change
C. increase
D. decrease
答案解析:答案为B。本题为词义推断题。结合划线部分所在的上下文,第五段和第七段提到了“maximum size”、“became smaller”与“grow bigger”,可以推断“size variation”就是体型变化,故答案为B。
3. From the passage, we can learn
.
A. pandas began to eat bamboo 2 million years ago
B. a species tends to grow smaller when numbers decline
C. the giant pandas were about a third the size of today’s pandas
D. pandas’ bamboo has played an important role in its development
答案解析:答案为B。本题为细节题。由第七段 ““A species tends to grow bigger when it reaches the peak of its population , but becomes smaller when numbers decline,” 可知,B选项正确。
由第一段 “...its bamboo diet dates back more than 2 million years ...” 可知,A选项与文章细节不符;由第四段 “...the giant pandas were about a third smaller than today’s pandas.”可知,当时的大熊猫比现在的小三分之一,言外之意就是当时的大熊猫的体型是今天大熊猫的体型的三分之二,正确表达应该是“the giant pandas were about two thirds the size of today’s pandas”,故C选项错误。结合第一段 “...its bamboo diet dates back more than 2 million years and may have played a key part in its survival.” 和倒数第二段 “... the panda’s focus on bamboo could have helped it survive all these years.” 两句话中的“may” 和 “could”, 对竹子的作用都是一种推测,不是完全确定的结论,故D选项与文章不符。
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