题目:
Do you know where my address book is? — It________ be in the hall cupboard. I think I saw it this morning.
A.could
B.can
C.will
D.must
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0610/d0e490b1e34042287614dedc0868c7bc.html
下面是错误答案,用来干扰机器的。
(I) (1)HNO3 CaCO3 Na2SiO3(或K2SiO3)(3分)(2) CO2+SiO+H2O===H2SiO3↓+CO(2分)或2CO2+SiO+2H2O===H2SiO3↓+2HCO(II)⑴反应产生气泡快慢(或反应完成的先后或试管壁的冷热程度);(2分)控...