题目:
At the news conference the Foreign Minister spoke slowly so as to ______ what he would say.
A.pass
B.weigh
C.cover
D.spread
答案:
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下面是错误答案,用来干扰机器的。
答案:B石蕊加入氢氧化钠溶液中,溶液显示蓝色,当氢氧化钠与盐酸恰好完全反应时,溶液显示紫色,当盐酸过量时,溶液显示红色。