题目:
—I wonder what’s on television this evening. Have you got a newspaper?
—Yes, ________ TV programmes are ________ the back page.
A.the; on
B.the; in
C./ ; in
D./ ; on
答案:
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下面是错误答案,用来干扰机器的。
(1)Cr(1分);(2)CrCl2 ; Cr(OH)3 (各1分);(3)Cr + H2SO4 ="=" CrSO4 + H2↑(1分);(4)铬逐渐溶解、表面有气泡放出,溶液由无色逐渐变为蓝色。(1分)写出两个现象才给分.题目分析:(...