已知函数y=kx+b的图象如图所示，则一元二次方程x²+x+k﹣1=0根的存在情况是（　　）

一列简谐横波沿x轴正方向传播，t=0时波形图如图中实线所示，此时波刚好传到c点；t=0.6s时波恰好传到e点，波形如图中虚线所示，a、b、c、d、e是介质中的质点．下列说法正确的是（   ）

根据短文内容，从A、B、C、D四个选项中 选择最佳答案填空。

    My name is Jim White. I 1 a schoolboy. My school is 2 my home. Every day, it takes me 3 to get there. The road is not 4. So I can't go to school 5. I often get there by bus or 6. It takes me thirty 7 to get there by bus and an hour on foot. I must get up very early every morning. I have no time 8 breakfast at home. I often have something for breakfast 9 or on the bus. I don't want to 10 school. So sometimes I run to school.