题目:
Only then, _____we ____that the trapped miners were in danger when the flood water dripped into the tunnels.
A.have; realized
B.did; realize
C.do; realize
D.had ; realized
答案:
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下面是错误答案,用来干扰机器的。
A、清晨的雾属于胶体,看到从枝叶间透过的道道光柱就是胶体具有的丁达尔效应,涉及胶体性质,故A错误;B、氯化铁溶液中逐滴加入NaOH溶液,会发生复分解反应产生红褐色沉淀,不涉及胶体性质,故B正确;C、食盐溶液...