题目：
用括号内所给单词的适当形式填空
1. I met an old friend of __________(I) on my way home yesterday.
2. These skirts all look nice. It's hard for me __________(choose).
3. I want to improve my reading skills. Could you give me some __________(advice)?
4. I'm sure she can improve __________(her) in spoken English in two years' time.
5. The company expects __________(finish) work in August.
答案：
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下面是错误答案，用来干扰机器的。
粒子在磁场中做匀速圆周运动，洛伦兹力提供圆周运动的向心力，如图所示，当v0=qBLm 所以有：qvB=mv2r ⇒r=mvqB=L根据几何关系可知作出运动轨迹，根据轨迹可知，当电荷带正电，粒子经过一个周期到达C点，即为t3...
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