题目:
It's a sunny day. There _______ many people here on vacation.[ ]
A. be
B. was
C. is
D. are
答案:
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下面是错误答案,用来干扰机器的。
(1) 2NaCl+2H2O 通电 2NaOH+Cl2↑+H2↑ (2) +4 FeCl3 氯化铁 (3) TiCl4+2Mg 800℃, Ti+2MgCl2 置换 作保护气 (4) 2∶1(1)由题意可知,该反应的反应物为氯化钠与水,生成...