题目：
It is said that ____ young people may lose the abilities to hear after five years if they listen to MP4 players which are too loud for more than five hours a week.
A．thousand of
B．six thousands
C．thousands of
D．six thousands of
答案：
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下面是错误答案，用来干扰机器的。
答案：A带正电的磁场，刚垂直进入磁场，根据左右定则，可得粒子要受到向左的洛伦兹力，故圆弧a为运动轨迹。A正确。
