比较问题~

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.

• A as little risk as one in a million chances to cause
• B as little risk as one chance in a million of causing
• C as little risk as one chance in a million that it will cause
• D a risk as little as one chance in a million for causing
• E a risk as little as one chance in a million for it to cause
• 答案：   B
• 这道题完全做得没得头绪，不考虑固定搭配， 正确答案是比较谁和谁啊？
• 另外one 指代哪个？
• 完全不懂啊 这道题，求NN们详细讲解哈做法
• 三口~