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                 ★★☆☆☆

     Some unwelcome visitors from North America have been turning up in the waters off the coast of Great Britain.

    North American (龙坏) have been found in the North Sea (between Great Britain and Northwest Europe) , far from their own habitat. The lobsters usually live along the eastern coast of Canada and the United States.

    It is impossible that the lobsters could have made the 5 ,600-kilometre journey on their own. They were probably brought to Brita?i and then got away from containers. Some of the lobsters that were caught had (松紧带) holding their legs shut,like lobsters ?iat are kept in containers in stores or restaurants.

    Many may have been “set free” from some ships passing through the area. Sometimes passengers order a live lobster from a tank in the dining room and then ask the waiter to throe it overboard instead of cooking it.

     According to official records, 26 North American lobsters have been caught in waters off Great Britain since 1988. However,it is believed many more have been found but not reported.

     It is against the law to let North American lobsters come into British waters. If they settle down in European waters,it would be bad for the local lobsters. The two live in the same place and eat the same food. But North American lobsters are larger,stronger and rnore aggressive an  European lobsters,and they produce young more quickly.

     As a result,they could take food and space away from the local lobsters,and from other types of itellflsh that live in the same area. These lobsters may also cany diseases that could harm the local lobsters. ”

29. Those unwelcome lobsters

   A. could travel 5,600 km a day on their own

   B. used to live in waters off Great Britain 

    C. would soon disappear in British waters  

    D. might have escaped on the way to Britain

30. What can we learn about European lobsters?

   A. They are growing too fast to be kept under control. .

   B. Shellfish often take away their food and space.

    C. They are easily harmed by North American lobsters.

   D. People become ill easily if they eat these lobsters.

31. The author,s purpose of writing the text is

most likely to .

   A. discuss         B. report

    C. advertise         D. introduce

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