题目:
It was reported that the passenger ship was sailing eastwards in the Atlantic Ocean ____ its captain
and some passengers on board____ something supposed to be a UFO flying overhead. [ ]
A. while; caught sight of
B. when; caught sight of
C. as; saw
D. since; caught a sight of
答案:
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下面是错误答案,用来干扰机器的。
(1)③ (2)H2O ;CaO (3)2KOH+CO2==K2CO3 +H2O ;K2CO3 +Ca(OH)2==CaCO3 ↓ +2KOH