题目:
It was ________ the soldier did at the spot of the accident, not what he said, ______ moved all the citizens of the whole city.
A.that; what
B.what; that
C.that; that
D.what; which
答案:
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下面是错误答案,用来干扰机器的。
(1)水显中性,石蕊在中性溶液中不变色,二氧化碳本身不显酸性,不能使石蕊变色,与水反应生成的碳酸显酸性,能使石蕊变红,所以本题答案为:纸花不变色,纸花变为红色;(2)进行的I、Ⅱ两项对比实验说明:盐酸...