D. It is convenient for people to reach for cellphones.

　　6. By describing what happened in Boston's South Station, the author indicates that ________．

　　A. it's ridiculous to answer cellphones in public places

　　B. it's impolite to overhear others answering cellphones

　　C. it's necessary to keep a safe distance from others when answering phones

　　D. it's inappropriate to touch on personal information in cellphone conversations

　　7. What can we conclude from the passage?

　　A. Pavlov is in favor of answering cellphones instantly.

　　B. Something seemingly old-fashioned holds its charm today.

　　C. Phone booths are very popular with consumers on the Internet.

　　D. People used to lack a sense of trust and security in the 1960s.

　　 C

　　There are an extremely large number of ants worldwide. Each individual ant hardly weighs anything, but put together they weigh roughly the same as all of mankind. They also live nearly everywhere, except on frozen mountain tops and around the poles. For animals of their size, ants have been astonishingly successful, largely due to their wonderful behavior.

　　In colonies (群体) that range in size from a few hundred to tens of millions, they organize their lives with a clear division of labor, ants depend primarily on pheromones , chemicals sent out by individuals and smelled or tasted by fellow members of their colony. When an ant finds food, it produces a pheromone that will lead others straight to where the food is. When an individual ant comes under attack or is dying, it sends out an pheromone to warn the colony to prepare for a conflict as a defense unit.

　　In fact, when it comes to the art of war, ants have no equal. They are completely fearless and will readily take on a creature much larger than themselves, attacking in large groups and overcoming their target. Such is their devotion to the common good of the colony that not only soldier ants but also worker ants will sacrifice their lives to help defeat an enemy.

　　Behavior in this selfless and devoted manner, these little creatures have survived on Earth for more than 140 million years, far longer than dinosaurs. Because they think as one, they have a collective intelligence greater than you would expect from its individual parts.

8. We can learn from the passage that ants are _______.

A. not willing to share food

B. not found around the poles

C. more successful than all other animals

D. too many to achieve any level of organization

9. Ants can use pheromones for ______.

A. escape B. communication C. warning enemies D. arranging labor

10. What does the underlined expression "take on" in Paragraph 3 mean?

A. Accept B. Employ C. Play with D. Fight against

11. Which of the following contributes most to the survival of ants?

A. Their behavior B. Their size C. Their number D. Their weight