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问题 不定项选择

如图，在x>0、y>0的空间中有恒定的匀强磁场，磁感应强度的方向垂直于xOy平面向里，大小为 B。现有一带正电粒子，在x轴上到原点的距离为x0的P点，以平行于y轴的初速度射入此磁场， 在磁场作用下沿垂直于y轴的方向射出此磁场。不计重力的影响。由这些条件可知

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A．可以确定粒子通过y轴时的位置

B．可以确定粒子速度的大小

C．可以确定粒子在磁场中运动所经历的时间

D．可以确定粒子的运动轨迹

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I love you，mum and dad!

Tears go out of my eyes when I talk to my parents over the phone.What are they doing when I call them？This is 小题1:_______ I want to know most.I have supper at 5 o’clock in the dining room. 小题2:_______ is no need for me to cook by myself，no need to wash the dishes. 小题3:_______，now it is the busiest time for my parents.Dad has to work every day.He works from seven o’clock in the morning to nine o’clock in the evening.Therefore，all the housework is left to my mum. 小题4:_______ her own job，she also has to work in the vineyard.

Every day she gets up at 4 o’clock in the morning，then works 小题5:________ dark.I promise 小题6:_______ to study hard in the university，because I am her hope.I promise her to take care of myself，because I am important to her.I promise her to lose weight because she says nice figure is an important factor in future’s competition.I promise her so much and I just want her to promise me that she can take care of herself and dad because they are just like 小题7:_______ blood in my body.I cannot live 小题8:_______ them.
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选择题
下列词语中加粗饲的解释不完全正确的一项是
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A. 干涸（干枯）  沧海桑田（农田）
B. 庇护（遮蔽，掩护）  浑然一体（形容完整不可分割）
C. 吞噬（咬）   一望无际（边际）
D. 锐减（锐气）铙有兴趣（丰富，多）
        
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