题目

“Billy! It is February 25, 2099, seven o’clock. Timeto __1__ and go to school.” said the clock-robot __2___ a mental voice. Then thekitchen-robot gave him toast and eggs. Billy was ___3__. While he was eating,the whole wall __4__ a TV screen and Billy thought that it was great havingrobots to do __5__ for him. Billy ate his meal watching a TV __6___. When hefinished eating, the ___7___ gave him his clothes very fast and __8___ him.Then Billy went off to school. When Billy went outside, he saw a car with no ___9__waiting for him. The car said, “Hello, I will be __10___ you to school eve空间存在水平方向互相正交的匀强电场和匀强磁场，电场强度为E=103 N/C，磁感应强度为B=1T，方向如图所示．有一个质量m=2.0×10-6 kg、带电荷量q=+2.0×10-6 C的粒子在空间做直线运动，试求其速度的大小和方向（g=10m/s2）．