C. observing the activities of bluegills

　　D. constantly filling the fish tank with water

　　答案：B　细节理解题。由第二段第七句话“If the bluegills are coughing the computer sends an alarm via email.”可知，人们可以通过电子邮件知道饮用水是否受到了污染。

　　C

　　(2017·太原调研)

　　There are several ways to break the technology code that teenagers have written among themselves.The following are ideas to help parents understand the sometimes confusing world of the teens.

　　Social Networking Sites: Sites like MySpace and Facebook appeal_to all generations and are a good way for a parent to understand what social standards your teen is living with.There are many ways to help you take part in your child's online activities.You also can be from an onlooker who keeps a bird' s eye view of his cyber world to an active member of his social group.

　　MMORPG: Massively Multiplayer Online Role—Playing Game comes in the form of games.A child can easily become addicted to them if no limits are set.To fully understand the attraction behind MMORPG, you can make your own account and character to explore the digital world.Playing the online games may seem strange at first to your teen, but experience has led me to only positive feedback from young people who can communicate with adults about their gaming experiences.

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