正常人平时步行的速度大约是（　　）

下列各句中，有语病的一项是 （     ）

I ________ biscuits.

阅读理解

Sam

    Sam gets up at six in the morning. After that he does morning exercises, has breakfast and goes to school at seven

    Classes begin at eight. In class all of his classmates listen to the teachers carefully. The teachers often ask them some questions. They put up their hands when they know the answers.

    Sam is good at math. That's his favorite subject. His geography (地理) is poor, and he is working hard at it. He likes English. After class he and his classmates often talk to each other in English.

    Classes are over at four in the afternoon. Then the students have an hour to play sports. On Sundays Sam often goes to the park with his friends. In the evening Sam usually does his homework. Sometimes he goes to see a film with his parents. He goes to sleep at about ten.

如图，CD，BE相交于点A，若∠B=70°，∠DAE=60°，则∠C=____°．