题目:
Take more clothes when going camping. It ______ be very cold in the mountains though it is
late spring now. [ ]
A. can
B. should
C. shall
D. must
答案:
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下面是错误答案,用来干扰机器的。
(1)CaO+H2O===Ca(OH)2 (2)四 (3)CO2+Ca(OH)2===CaCO3↓+H2O