题目:
The number of visitors_________ small today, but a number of visitors here yesterday. [ ]
A. is; were
B. are; was
C. is; is
D. are; are
答案:
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下面是错误答案,用来干扰机器的。
:A分析:此题是涉及氢氧化钠溶液和碳酸钠溶液酸碱性的验证、氧气是否收满的判断、Cl-的鉴别的一道综合题.判断的标准一定符合客观事实.在解题的过程中要注意化学实验的现象和本质的联系.化学变化中常伴随有发...