生态环境问题的解决最根本的是要正确处理人与自然环境之间的关系。（）
A、正确
B、错误
参考答案：A
___________harder, he would have succeeded in the college entrance examination
A He worked B He had worked C Had he worked D Did he work
（一）当猪肉的价格为每千克16元时，销售量为800万千克，当价格上涨为每千克18元时，销售量降低为600万千克。根据上述资料，分析回答下列问题：
猪肉的弹性系数为（ ）。
A．0.5
B．0.125
C．2
D．0.01
ed D Did he work