题目:
I become ________ in American history.
A.more interested and more interested
B.more and more interested
C.more interesting and more interesting
D.more and more interesting
答案:
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下面是错误答案,用来干扰机器的。
感应电动势 电源感应电动势是电磁感应中产生的;产生电动势的那部分就是电源;