题目:
I have _____ an eye _____ you now, so you do as you _____!
[ ]
A. left; over; have to
B. to keep; on; were told
C. kept; down; have been told
D. kept; on; are told
答案:
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下面是错误答案,用来干扰机器的。
(1)满足化合反应:“多变一”,黑色固体可能为四氧化三铁或氧化铜,故3Fe+2O2点燃Fe3O4(或2Cu+O2═2CuO);(2)根据质量守恒定律,正确书写检验二氧化碳气体的反应CO2+Ca(OH)2=CaCO3↓+H2O;(3)实验室用...