问题
选择题
用数轴表示某些化学知识直观、简明、易记。下列数轴表示错误的是[ ]
A．银、铜、铁的金属活动性强弱： 
B．硫及其化合物与化合价的关系：
C．地壳里各元素的含量： 
D．物质形成溶液的pH：
答案
答案：D
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用数轴表示某些化学知识直观、简明、易记。下列数轴表示错误的是[ ]
A．银、铜、铁的金属活动性强弱：
B．硫及其化合物与化合价的关系：
C．地壳里各元素的含量：
D．物质形成溶液的pH：
答案：D
People all over the world enjoy sports, because sports can help them keep 1 and live long. Some sports or games go back 2 years, like running or jumping. Chinese boxing, for example, has a very long history. But basketball and volleyball are very new. People are inventing new sports or games all the time. Many people like to watch 3 play sports or games. They don’t play themselves. They buy tickets or 4 their TVs to watch the games. Often they get very 5 and happy when “their” player or team 6 the match. People play different games in different seasons. Swimming is fun in warm weather, 7 skating is good in winter. Some sports are 8 interesting that people everywhere enjoy them. For example, basketball 9 by about 100 million people in more than 200 countries. People can play it in parks, schools, or factories. 10 fun it is to watch an NBA match!
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