This is Kate Smith. She is 13 years old. She lives in Guangzhou. She studies in No.10 Middle school. Her parents work there. They are both English teachers. They are form the UK. She likes eating junk food. She doesn't like playing sports. She has one healthy habit: She sleeps for 9 hours every night.
    Kate Smith has a brother. His name is Jack Smith. He is 11 years old. He doesn't eat junk food. He likes playing sports. He often runs, plays basketball, and goes swimming. He eats fruit every day. He likes eating vegetables. But he has an unhealthy habit: He sleeps for 6 hours every night.

运用表格数据进行统计分析是历史学习的一种重要方法．从下表中我们可以分析得出的结论是（    ）

如图甲,四边形ABCD是等腰梯形,$AB\parallel CD$.由4个这样的等腰梯形可以拼出图乙所示的平行四边形,则四边形ABCD中$\angle A$度数为 (    )