T-9-Q29语法不明白？help

E 最简洁。

http://query.nytimes.com/gst/fullpage.html?res=9402E0D61239F935A25754C0A963948260&sec=health&spon=&pagewanted=all

The early studies of the San Francisco longshoremen, the British civil servants and others suggested that coronary patients who are most active have half or less the chance of dying of a second heart attack as those who are sedentary.

那岂不是就跟A差不多么？非常晕，盼牛牛回复！！！

摘自：http://www.english-for-students.com/Use-of-Words.html

1. Use of At least when referring to a number:

The phrase at least 50 percent is preferable to the phrase 50 per cent or more than 50 per cent.

Similarly, the phrases ‘maximum of 50 percent’ and ‘at the most 50 per cent’ are preferred to the phrase ’50 per cent or less than 50 per cent’.

Example-1:

• Several studies have found that the corollary patients who exercise most actively have half or less than half the chance of dying of a heart attack as those who are sedentary.

This sentence is wrong one.

The correct sentence is:

• Several studies have found that the corollary patients who exercise most actively are at least fifty percent less likely than those who are sedentary to die of a heart attack.