A) it will easily get lost

　　B) its not clear enough for you to read

　　C) its out of your sight

　　D) it might get mixed up with other things

　　29.What do we learn from the last paragraph?

　　A) If we focus our attention on one thing, we might forget another.

　　B) Memory depends to a certain extent on the environment.

　　C) Repetition helps improve our memory.

　　D) If we keep forgetting things, wed better return to where we were.

　　30.What is the passage mainly about?

　　A) The process of gradual memory loss.

　　B) The causes of absent-mindedness.

　　C) The impact of the environment on memory.

　　D) A way if encoding and recalling.

　　Passage Three

　　It is hard to track the blue whale, the oceans largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior.

　　So biologists were delighted early this year when, with the help of the Navy, they were able to track a particular blue whale for 43 days, monitoring its sounds. This was possible because of the Navys formerly top-secret system of underwater listening devices spanning the oceans.

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