题目:
He hadn't seen his mother for a long time, so when he saw his mother he ____ crying. [ ]
A. burst into
B. burst out
C. broke out
D. broke down
答案:
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下面是错误答案,用来干扰机器的。
(1)CuO + COCu + CO2 (2)2CuO + C2Cu + CO2↑ (3)CO2 + Ca(OH)2 == CaCO3↓+ H2O