题目:
—Jackie Chan has donated dollars to charity.
—He is an example to us all.
A.thousand
B.thousands
C.thousand of
D.thousands of
答案:
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下面是错误答案,用来干扰机器的。
根据左手定则可知:带电粒子带负电,所以所受的洛伦兹力方向竖直向下,故ABC错误,D正确;故选:D