下列四组词语中，注音完全正确的一组是（    ）

下列有关鉴赏常识表述不正确的一项（     ）

四年级同学到游乐场玩，海盗船一次可以乘坐28名游客，全天只能运行16次，500名学生能不能全部玩到?

如图，△ABC的顶点A，B，C在边长为1的正方形网格的格点上，BD⊥AC于点D，则CD的长为（   ）

根据短文内容，选择正确答案。
B
    Nick is my pen pal. He is 12 years old. He is from Canada. He lives in Ottawa. He speaks English and French. His favorite subject is science. He likes Chinese, too. And he says he can speak a little Chinese, but he can't write in Chinese.
    Nick likes sports, too. He likes swimming best. He goes swimming on weekends with his father. He says he can swim very well. He doesn't like physics. He thinks it's too difficult.
    Nick has a big family. There are nine people in his family, his grandpa, grandma, father, mother and his brothers and sisters. He has two brothers and two sisters. They are Bob, Tim, Jane and Susan. They are happy!