3. What is NOT true about Choes finding？ （信息词）4段3行
A. When an ant dies，it produces a "I am dead" signal.
B. Living ants have the death chemical on their bodies.
C. Ants have two sets of chemicals on theft bodies.
D. Ants have the "I am not dead" chemical on their bodies.
4. According to Choes hypothesis，（信息词）6段1行
A. an ant still smells like a living when it dies.
B. the "I am dead" chemical leaves the ants body when it dies.
C. the "I am not dead yet" chemical is left when an ant dies.
D. the "I am not dead yet" chemical leaves the ants body when it dies.
5. What is the result of the test on Choes hypothesis？（信息词）7段1行
A. It proves that his hypothesis is time.
B. Not enough evidence has been found to support his hypothesis.
C. It shows that his hypothesis is wrong.
D. It indicates that his hypothesis needs revising.
答案与题解：
1. C 根据文章第二段和第三段的表述，阿根廷蚂蚁身上有种化学物质，它会告诉其他蚂 蚁“I am dead.”。文章没有说这种物质有毒，也没有说它能导致或预防死亡，所以其 他三项都是错误的选择。
2. B keep sb. from doing sth. 这个句型的意思是：使……不做……，阻止……去做……。所以只有 B 是正确理解。
3. A 第三段和第四段告诉我们，蚂蚁身上会带有两种化学气味，“I am not dead yet” 和“I am dead”。这层意思分别在 B、C 和 D 中的表述出现。短文的第六段告诉我们，蚂蚁死去时 ，“I am not dead yet”的气味就离开了它的躯体，剩下的就是“I am dead” 的 气味 .“I am dead”的气味不是死后新产生的化学物质。所以 A 是正确的选择。
4. D 短文第六段告诉我们，当“I am not dead yet”化学物质离开蚂蚁的躯体，“Im dead” is left.这里，be left 的意思是：留了下来。所以，其他选项都是错误理解。
5. A 最后一段告诉我们，Choe 和他的研究小组用阿根廷蚂蚁蛹进行实验，结果与他的假设吻合，即证实了他的假设。