練習：

　　1. What is meant by “death chemical” mentioned in paragraph 3？

　　A A chemical that contains poison. B A chemical that causes death.

　　C A chemical that announces death. D A chemical that prevents death.

　　2. Which of the following is closest in meaning to the question “What keeps ants from hauling away the living dead？ （paragraph 4）”？

　　A How do ants know what is to be hauled away from the dead ants？

　　B What prevents ants from removing the ants that are not yet dead？

　　C What do ants do to keep themselves away from the dying ants？

　　D What prevents ants from being carried away after they die.

　　3. What is NOT true about Choes finding？

　　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，

　　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？

　　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.

　　答案與題解：

　　1. C 根據文章第二段和第三段的表述，阿根廷螞蟻身上有種化學物質，它會告訴其他螞 蟻“I am dead.”。文章沒有說這種物質有毒，也沒有說它能導致或預防死亡，所以其 他三項都是錯誤的選擇。

　　2. B keep sb. from doing sth. 這個句型的意思是：使……不做……，阻止……去

　　做……。所以只有 B 是正確理解。

　　3. A 第三段和第四段告訴我們，螞蟻身上會帶有兩種化學氣味，“I am not dead yet” 和“I am dead”。這層意思分別在 B、C 和 D 中的表述出現。短文的第六段告訴我們， 螞蟻死去時 ，“I am not dead yet”的氣味就離開了它的軀體，剩下的就是“I am dead” 的 氣味 .“I am dead”的氣味不是死后新產生的化學物質。所以 A 是正確的選擇。

　　4. D 短文第六段告訴我們，當“I am not dead yet”化學物質離開螞蟻的軀體，“Im dead” is left.這里，be left 的意思是：留了下來。所以，其他選項都是錯誤理解。

　　5. A 最后一段告訴我們，Choe 和他的研究小組用阿根廷螞蟻蛹進行實驗，結果與他的假 設吻合，即證實了他的假設。