阅读《核舟记》，完成下列各题。

    舟首尾长约八分有奇，高可二黍许。中轩敞者为舱，篛篷覆之。旁开小窗，左右各四，共八扇。启窗而观，雕栏相望焉。闭之，则右刻“山高月小，水落石出”，左刻“清风徐来，水波不兴”，石青糁之。

美国是世界上经济高度发达的国家，下面几位同学对美国地理特征的描述，不正确的是（　　）

请将下列动物和所属类群用线连接起来。
A丹顶鹤 ____                          a软体动物
B鲫鱼____                              b鸟类
C对虾____                              c鱼类
D蝙蝠____                              d节肢动物
E扬子鳄  ____                         e哺乳类
F乌贼____                               f爬行类

    The polar bear is a very big white bear. We call it the polar bear because it lives in the Arctic Circle（北极圈） near the North Pole.

    The polar bear lives in snow and ice. At the North Pole there is only snow, ice and water. There is not any land. The polar bear has a very warm coat because the weather is cold in Arctic Circle. You can't find the polar bear easily in the snow because its coat is white.

    A grown-up polar bear is usually about three meters long and weights about 450 kilos. It can stand up on its back legs because it has very wide feet. It can use its front legs like arms. The polar bear can swim very well. It catches fish and sea animals for food. It goes into the sea when it is afraid. People kill the polar bear for its beautiful white coat. The governments of Canada and United States call on that people should stop killing polar bears. They don't want these beautiful animals to die out.

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