某方程在区间D=（2，4）内有一无理根，若用二分法求此根的近似值，且使所得近似值的精确度达到0.1，则应将D分____ 次．

阅读理解。

    My name is Jim. My favorite day is October 18th, because it's my birthday. I am very happy on that day. I eat eggs for breakfast. Then my friends come to my home and play with me. We sing and dance. Someone plays the piano and someone plays the guitar. Lunch is very nice. After lunch, my parents take me to see a movie. My favorite movies are comedies and action movies. After supper, my parents, my sister and I watch TV. Then I go to bed at ten thirty. I don't do my homework on that day. I am very tired but happy on my birthday。