大全637 section－04－11

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

(A) have half or less than half the chance of dying of a heart attack as those who are sedentary

(B) have half the chance, or less, of dying of a heart attack than those who are sedentary do

(C) have half the chance that they will die of a heart attack, or less, than those who are sedentary do

(D) are at least fifty percent less likely to die of a heart attack as those who are sedentary（E）

(E) are at least fifty percent less likely than those who are sedentary to die of a heart attack

请NN们帮忙看看，为什么选E？其他项比如A是不是错在表达不简洁上？先谢啦！

谢谢！我想几个选项中的as应该是不对的。

再问：大全643 section－03-18

Since 1970 the number of Blacks elected to state and federal offices in the United States has multiplied nearly four times.

(A) has multiplied nearly four times

(B) has almost quadrupled

(C) has almost multiplied by four

(D) is almost four times as great（B）

(E) is nearly fourfold what it was

请问A和C为什么不对呢？不知道multiply的用法有什么要求没有？还有E如果把时态改成一般完成时，这里的fourfold用法对么，是不是做形容词讲？

每次看到有关倍数比较的题目就比较晕菜～～～

先谢了

multiply的用法应该是multiply A by B 就是A乘以B 。 Four times 已经是四倍的意思了。有重复的嫌疑。

C中 应该是 number been multiplied by four才对啊。

谢谢！

是不是可以这样理解：当multiply当主动语态时，表示“乘以”，如multiply A by B 就是A乘以B

当用作被动语态时，应该是：sth be multiplied by  （one，two～～）表示增加几倍？

不知道理解对不对

我的理解是multiply只表示乘和增加 。

Longman的解释:

[intransitive and transitive] to do a calculation in which you add a number to itself a particular number of times
ￚsee also divide Children will learn to multiply in the second grade.
multiply something by something
Multiply the total by 12.
2
[intransitive and transitive] to increase by a large amount or number, or to make something do this
The amount of information available has multiplied. Smoking multiplies the risk of heart attacks and other health problems.
3
[intransitive] to breed
Bacteria multiply quickly in warm food.