(a-b)(a+b)=a2-b2

integer

漏看：at least 100
变量相同：
4 percent of the students at the school who study French also study Japanese
10 percent of the students at the school who study Japanese also study French

average sales

（E) "in athletics" is far general and out of discussion. Inhaling pure oxyen doesn't increase muscular reabsorption of oxygen doesn't mean that it is not useful in other athletic areas.

Reasoning: Magu should donate because the donations help Magu increase its sales.
A weakner should be that the donations won't help increase sales.
(D) doesn't point out how "donations benefit little to the community" impact consumers' behaviors or the increase sales. Assuming that people would not buy Magu's products because their donations benefit little to the community is beyond the context.
(E) same problems with D
(B) donations hurt spending in advertisement, thus hurting sales.

选项d和题干内容冲突，题干已经提到亩产减少了，亩产指的是每亩的产量下降了，也就是收成下降了，而D是在用一种很狡猾的方式让人们把植株的数量和产量挂钩，得出产量应该是double 的错误推断。
A是最佳选项，因为影响利润的因素为成本和收入，A将成本这一项解释了。

定语从句不是可以根据最合理的意思，判断修饰谁吗？

1、to another one=individual
2、Almost like clones in their similarity to one another...” That phrase includes the plural pronoun “their”, so it needs to be followed by a plural noun that could reasonably be described as “like clones” in terms of their similarity to each other.
3、“species” can also be plural, but in this case, it’s followed by “is”, and then “its” refers back to “species” later in the sentence. So “species” is definitely singular in this particular sentence.

错选了c。 过去完成式。原句想说 a call was included when drafting. c变成了，a call had been included when adopted. 意思变了。

请问一下并列从句里面的and that其中的that什么时候可以省略什么时候必须保留？谢谢

"数字之间的比较用greater不用more，数字只有大小没有多少 B错误
未划线部分是单数，they 不正确，排除CD
now with错：第一，修饰主语gyrfalcon，表示伴随survive的动作，不合逻辑 排除E
"

ABC 比较对象不对等 排除
lag behind与less重复 排除D

D and后面不是完整句子
C and之前不是完整句子
B when多余
A主动是错的

"A runon
DE不是完整句子
C having been constructed时态不正确"

"Unlike XXX, XXX 两个XXX完全对等，不能有其他成分，排除CE

除forbid外，禁止系动词后面接(from) doing,，如：
prohibit/inhibit/prevent/stop/deter/restrain/ban sb from doing sth，禁止/阻碍/阻止某人做某事，from doing意指禁止某人在某物进行时去沾染它，禁止某人参与某事的进程
forbid似乎是唯一一个表示禁止，后面不接from doing只能接to do的动词 A错误

B/C：做主语和状语的区别，New Mexico授予特权，而不是在新墨西哥授予特权 C错误

prescribe sth for sb
"

at是一定是加的，否则会有歧义：wrist可以理解成是在替代cartilage 也可以理解成是在替代 elbow，加了at则只能替代elbow；排除AE
C instead of 前后不平行 排除
B because of 加名词 being attached 错误

"这里要表达转折的意思，所以CDE都不对
B错误 While in her prime是主谓省略的形式，while前出现的句子主语是her career，还原到该句中为while her career was in her prime，逻辑含义不合理，应该是Olive Fremstad本人两个in her prime。"

" carbon dioxide 不可数 必须用less修饰 other gases可数 用fewer修饰，排除CDE

as well as做介词，主句为简单时态sb do sth，后面动词通常用doing，如：He sings as well as playing piano.他会唱歌以及弹钢琴。
如果有情态动词或助动词，后面动词用原型，He can sing as well as play piano.
前面是to do时，后面用原型。He want to sing as well as play piano."

It is awkward and confusing to string together relative clauses: evidence that
suggests that the elephant. . .
with cannot be followed by an independence clause.
"is descended from" describes the present-day elephant;
"evolved" ---not how it is evolving today.