好绕。。。不过解析很棒！

’‘ Straight B. If bowerbuilding is learnt by observing elders it has to be cultural.
D does not say anything about the styles of the local populations...’‘

a = 1/2 , q= -1/2, n = 10.
等比数列
S=( (1/2) * (1- (-1/2)^10) ) / (1-(-1/2)
S=(1023/1024 ) / 3
Since 1023/1024 is close to 1,
1/3 is between 1/2 and 1/4.
So the answer is D

in choice (c), "distantly related to Tyrannosaurus rex" is not parallel to "closely resembled South American predatory dinosaurs". you can't put a participle in parallel to a past-tense verb.
https://www.manhattanprep.com/gmat/forums/prep2-sc-65306-the-bones-of-majungatholus-atopus-t5574.html

这题平行成了 as ,,once引导内容的平行

这是因果推理把？

$2000 should be $1000?

A correct
B 不是descendant release African honeybees
D when 表示同时发生了

A for monitoring
B as many无意义
C correct
D that指代routes错
E that指代routes错

A rate不能说fast
B not parallel
C growing them naturally逻辑有误
D correct
E not parallel

不定式和从句的区别，用从句的话表示客观，状态不发生改变。用不定式强调主观动作改变了状态，此处前面的S的状态未发生改变

比较对象

可以这样理解吗？Just like后➕名词， just as 后➕句子？

误选了d，发现主语错误

虚拟语气主句用would/could do
D that E 句尾it指代不清

否定词+so much as才可以表达不是而是的意思，如果分开就表达为与其说……不如说……的意思，而且CDE的but也不对

(A) and that结构没有平行对象
(B) 去掉as后,后半句变为forest also supply… , and sources… are providers…意思变为:森林也提供了有潜在价值的药材,并且建筑材料和柴火的来源成为了全球上百万岗位的提供者. 改变了原句意思
(C) and, as sources of building…结构没有动词,跟also supply不平行
(D) 语法上sources of…和pharmaceuticals并列,改变了原句的意思
(E) 正确, forsts also supply…and provide…结构平行

60×3 + 50×11 + 45×30 = 2080

A 为什么不对，不是应该选下雨但也不一定导致丰收的选项吗？D虽然也说明不一定丰收，甚至可能收成不好，导致价格上涨，但是D与气象学家的预测不相关呀。请老师解答，谢谢。

先给出是谁，再做属性描述