题目

完形填空。 Do you likesports? Do you1tennis, basketball or baseball2school? I'mAlex, and my3name is Green.4kidsare in my family. We like sports. My brother Ian and I are in the5class.We can play basketball and soccer together. Ian is tall and strong (又高又壮), so it's6forhim to play basketball. But for me, it's very difficult. I7asister and she's only 9. She likes ping-pong. We always play ping-pong afterschool, and it's8. I think it's relaxing to play9.In the evening, we can10some sports games on TV. I love sportsand I'm happy. （1） A . spell B . say C . pla一个静止的放射性原子核发生天然衰变时，在匀强磁场中得到内切圆的两条径迹，如图5 所示，两圆半径之比为44∶1，则（    ） A．轨迹2是反冲核的径迹 B．发生的是α衰变 C．反冲核的核电荷数是90 D．反冲核是逆时针运动，放射出的粒子是顺时针运动