问题
选择题
向某澄清溶液中滴加用稀盐酸酸化的氯化钡溶液，产生了白色沉淀，对该溶液判断正确的是[ ]
A．一定含有SO42-
B．可能含有SO42-或Ag+
C．含有SO42-或 Ag+或SO32-
D．一定是硝酸银
答案
答案：B
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向某澄清溶液中滴加用稀盐酸酸化的氯化钡溶液，产生了白色沉淀，对该溶液判断正确的是[ ]
A．一定含有SO42-
B．可能含有SO42-或Ag+
C．含有SO42-或 Ag+或SO32-
D．一定是硝酸银
答案：B
All over the world people enjoy sports. Sports help people to keep , happy and to live longer. People play different in winter and summer. is good for swimming. And in winter people often go skating. Some sports are very and people everywhere like them. For example, football is very popular. In China, most people, men, , boys and girls, like to watch football games. They often talk about it. and jumping began long, long ago. But basketball and volleyball are rather . People began to play them not long ago. And people are new sports or games all the time. Water skiing is one of . People different countries may not be able to understand each other, but after a game they often become friends.
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