题目

阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式(最多限填3个单词)。 Mike is a 16-year-old student. He has a very healthy lifestyle,, one year ago, he was not so healthy. From Monday to Friday, he (study) every day but hardly did any sports. He often used the Internet. his parents asked him to exercise, he never did, He sometimes helped his mother with some(housework), but only once a week. On weekends, he liked (watch) television, Then the bad (result) came—he became fat and had few friends. One day, the doctor in his school 4．如图是反射弧的结构图，图中的5是（　　）A．感受器B．效应器C．神经中枢D．传出神经