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决定国家结构形式的主要因素是当时的国际形势和国内的阶级力量对比关系。（）
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宪法是各种政治力量对比关系的集中反映,当政治力量对比关系发生质的变化时,往往产生对宪法内容的修正案。()
海关对报关企业和进出口货物收发货人两类报关单位规定了不同的报关注册登记条件。对于报关企业，海关要求其必须具备规定的设立条件并取得海关报关注册登记许可。对于进出口货物收发货人则实行备案制，其办理报关注册登记的手续和条件比报关企业简单。
【C9】
听力原文：W: I haven't seen you for a while. Have you been away？
M: Yes, I just got back from vacation. I took a tour around the Great Lakes. Have you ever been there？
W: Oh, yes! When I was young, I lived in Erie county in New York and I used to go swimming in Lake Erie all the time. We also went to Lake Ontario in Canada.
M: But I thought that Lake Erie is so polluted that everything living in it had died.
W: At one time Lake Erie was almost dead. There was so much algae that the oxygen supply was practically used up.
M: It was the amount of phosphate in detergents that caused the excessive growth of algae, wasn't it？
W: Yes, but since both the U. S. and Canada have now limited phosphate in detergents, there have been tremendous gains in the fight against water pollution. In fact, all the Great Lakes will be ninety percent improved within the next generation.
M: I'm glad to hear an environmental success story at last!
What's the main subject of this conversation？
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