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题库 / Prep2007E2-SC-9
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
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possibility/likelihood 只能接of/that，表示可能性，控制力弱，不能接to do
opportunity/chance 可以接of/that也可以接to do，区别在于：如果指机会大小等数学量的表达，只能接of，如：have a 70% chance of doing sth, 不能说have a 70% chance to do sth；如果强调有机会去开始某事，可以用 the opportunity/chance to do sth;
risk of doing sth；risk表示风险，对动作的发生与否控制力弱，不接to do；risk to sth/sb，对某事的风险；有引发癌症的风险，这个引发不单是指将来引发，它可以是过去引发、现在引发、将来引发，这些都是风险，所以更接近一种惯常的状态，不用 will
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