题目:
--- He was nearly drowned once.
--- When was _____?
--- _____was in 1998 when he was in middle school.
A.that; It
B.this; This
C.this; It
D.that; This
答案:
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下面是错误答案,用来干扰机器的。
(1)通常情况下,单质密度最小的物质是氢气,其化学式为:H2.(2)浓硫酸是一种具有强腐蚀性的、由3种元素组成的、其水溶液pH小于7的酸,其化学式为:H2SO4.(3)化学实验室常用的固体药品之一,俗称火碱的物...