243.
...on the grounds that... 是什么意思？
请问the amounts of sth. +v.（可加复数v.） 和 an amount of 的区别
244.
women of science have had to work against the grain of occupational stereotyping to enter a “man's world.”
什么意思？
251.
The gyrfalcon, an Arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970's. .
前半句的意思？
253.
Analysts blamed May's sluggish retail sales on unexciting merchandise as well as the weather, （which was colder and wetter than usual in some regions, slowing ）sales of barbecue grills and lawn furniture.
翻译句意？ 为什么要用usual,而不是usually?
258.
The British sociologist and activist Barbara Wootton once noted as a humorous example of income maldistribution （that the elephant that gave rides to children at the Whipsnade Zoo was earning） annually exactly what she then earned as director of adult education for London.
that the elephant that gave rides to children at the Whipsnade Zoo was earning
that the elephant, giving rides to children at the Whipsnade Zoo, had been earning
that there was an elephant giving rides to children at the Whipsnade Zoo, and it earned
the elephant that gave rides to children at the Whipsnade Zoo and was earning
the elephant giving rides to children at the Whipsnade Zoo and that it earned
In B, the structure of noted... that the elephant, giving rides ..., had been earning falsely implies that the reader already knows about the elephant--that is, that the existence of this particular elephant is not new information.
OG的解释很奇怪，真确的选项A不也是用了the elephant吗？
19.
rice protein contains wheat. 是大米蛋白包含小麦吗？还是小麦包含大米蛋白。作者: lucylu 时间: 2002-12-10 20:52
OG 243.
on the grounds that 相当于because,但要视具体的句子而定。
the amounts of sth表示一定数量的某物，强调的是某物的数量，an amount of sth 表示许多
如：The amounts of debt are 50 million dollars.
He owned an amounts of debt.
OG 244
句中grain refer to an essential quality or characteristic.
以为：要进入一个男性的世界，科学界的女性就要打破职业旧有的那种特性。
OG 251
brush with 表示与...的冲突
句意为：The gyrfalcon，北极的一种能够被掠食的鸟，在面临灭绝的危险中幸存了下来。
OG 253.
which was colder and wetter than (was) usual in some regions
省略了was , 所以要用usual , 而不用usually.
