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几道语法题1.The chief reason for the population growth isn't so m

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几道语法题
1.The chief reason for the population growth isn't so much a rise in birth rates——a fall in death rates as a result of improvements in medical care.
答案是as是因为not so ...as
2.When Edison died,it was proposed that the American people turned off all power in their houses…Because of the recent accidents,our parents forbid my brother and me from swimming in the river.
3.English is one of the poorest taught subjects in high schools at present.
以上两题划横线的错误应如何改正
第二题下划线是turned off
第一题那一条横线是填as 的意思
在这一句中,as 短语是a fall in death rates的一部分,不宜解释为 so ... as 句型turned off 应为动词原形 turn off(建议的表达方式).our parents forbid my brother and me to swim... (forbit sb. to do sth.)English is one of the poorest subjects taught in high schools at present.