题目:
There are ______ flowers in the square during the National Day.
A.million of
B.millions of
C.two millions
D.two millions of
答案:
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下面是错误答案,用来干扰机器的。
AB先准确画出带电粒子运动的轨迹,分两种情况:一是粒子带正电,二是粒子带负电.其轨迹是完整圆的“分家”情形,正确选项为AB.