People can often see a talking parrot on a TV show, in a movie, or even in someone's home. The parrot has learned {#blank#}1{#/blank#} (copy) sounds that people make. Dolphins, bats, and some other animals also copy sounds. Now we can add elephants {#blank#}2{#/blank#}this list of copycats (盲目模仿者).

    Dr. Joyce Poole is an expert,{#blank#}3{#/blank#}studies the sounds of elephants. While she was in Kenya, she would hear strange noises {#blank#}4{#/blank#} (make) by Mlaika after sunset. Mlaika was{#blank#}5{#/blank#} 8-year-old African elephant and it lived near a highway.

    Dr. Poole says that she couldn't tell the {#blank#}6{#/blank#} (different) between Mlaika's call and the {#blank#}7{#/blank#} (distance) truck noise. Why did it copy the sounds of the trucks driving by? Animals that are able to copy sounds may enjoy {#blank#}8{#/blank#}(practice) new sounds. When they {#blank#}9{#/blank#} (keep) outside of their natural environment, they may copy unusual sounds. 

    So far Dr. Poole {#blank#}10{#/blank#}(spend) 18 years with two female Asian elephants. Asian elephants make sounds like birds to talk with one another.

    Parrots, dolphins, humans, and elephants show that being a copycat is one way that animals and people make new friends and keep old ones.

    Mr. Robinson had to travel somewhere on business. As he was{#blank#}1{#/blank#}a hurry, he decided to go by air. He liked sitting beside a window when he was flying, {#blank#}2{#/blank#}when he got onto the plane, he looked for a window seat. He found all of them already {#blank#}3{#/blank#}(take) except one. There was a soldier sitting in the seat beside {#blank#}4{#/blank#}. Wondering why this one had not been taken, Mr. Robinson at once went towards it.

    When he reached it, however, Mr. Robinson saw that there was a notice stuck on the seat. It said, “This seat{#blank#}5{#/blank#}(keep) for proper load balance, thank you.” Because he had never seen such a kind of{#blank#}6{#/blank#}(usual) notice in a plane before, Mr. Robinson was a little surprised. But he thought that the plane must be carrying something {#blank#}7{#/blank#}(particular) heavy in it, so he walked on and found{#blank#}8{#/blank#}empty seat, not beside a window, to sit in.

    Two or three people tried to sit in the window seat beside the soldier, but they too read the notice and went on. When the plane was nearly full, a very pretty girl hurried into the plane. The soldier,{#blank#}9{#/blank#}was watching the passengers coming in, quickly took the notice off the seat beside his and in this way succeeded in having the company of a{#blank#}10{#/blank#}(beautiful) during the whole trip.

    Without proper planning, tourism can cause {#blank#}1{#/blank#} (problem). For example, too many tourists can flow into public places {#blank#}2{#/blank#} are also enjoyed by the natives of a country. If tourism create too much traffic, the local people will become {#blank#}3{#/blank#} (happy). They begin to dislike tourists and to treat them {#blank#}4{#/blank#} (impolite). They forget how much tourism can help the country's economy. {#blank#}5{#/blank#} is important to think about the people of a destination (目的地) country and how tourism influences {#blank#}6{#/blank#} (they). Tourism should help {#blank#}7{#/blank#} country keep its customs and its beauty should attract tourists. Besides, tourism should also increase the wealth and {#blank#}8{#/blank#}(happy) of the locals.

    Too much tourism can be a problem. If tourism {#blank#}9{#/blank#} (grow) too quickly, people must leave other jobs {#blank#}10{#/blank#}(work) in the tourism industry. This means that other parts of the country's economy can suffer. On the other hand, if there is not enough tourism, people can lose jobs. Business can also lose money.