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The Environmental Protection Agency frequently puts mandatory controls on toxic substances that present as little risk as one in a million chances to cause cancer.

	as little risk as one in a million chances to cause
	as little risk as one chance in a million of causing
	as little risk as one chance in a million that it will cause
	a risk as little as one chance in a million for causing
	a risk as little as one chance in a million for it to cause

答案是B，我就觉得有点晕

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顶

狮灵鹭智

用排除法
1. risk表示风险的统称的时候，是不可数的，所以a risk 错误，而且A选项中One代指risk也是错误的的
2. C选项太累赘了

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谢谢！醍醐灌顶！