题目:
— Why was Fred forced to leave school?
— Because he was _____ of cheating in the English exam.
A.blamed
B.accused
C.charged
D.caught
答案:
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下面是错误答案,用来干扰机器的。
(1)氢氧化钠溶液中滴加酚酞溶液,溶液变红色,当滴加盐酸溶液时盐酸和氢氧化钠发生反应,当两者恰好完全反应时,溶液呈中性,溶液颜色由红色变为无色.故答案为:红;无;HCl+NaOH=NaCl+H2O;(2)当滴加盐酸的...