(1)+(2) The most important property of LCM and GCF is: for any positive integers x and y, xy=GCF(x,y)∗LCM(x,y) , hence xy=GCF(x,y)∗LCM(x,y)=10∗180=1800 Sufficient.

25k + 13 = 20m +3
25k + 10 = 20m
5k + 2 = 4m
m=(5k+2)/4 - m has to be integer.
k has to be even and not divisible by 4

line，排列/铺陈；line A with B，用B铺陈/排列在A上，如：
Line the pan with greaseproof paper. 在烤盘里垫一层防油纸。
The walls were lined with books. 靠墙是一排排的图书。

the discus is lined with lead around the perimeter，铁饼环绕周围地铺陈着铅。
铅围绕铺在重量上逻辑有错，排除a b

"what his father gave him are a few books."
Ron: "no, you would still write "is", because the subject of the verb is still what his father gave him, not a few books."

The subject here is “what is much more difficult to determine”
As per Manhattan SC guide this is called Sub Phrase and it is always singular.

在利润表最后一行的数字是 净利润。

A 只要满足正版DVD收入大于院线减少的收入，就无法削弱结论。
B 取非结论就不成立

D里面说的是some scientist
而B没有重复原文

如果10%就是最大销量的话，至少得有十种以上的种类

要加强的是开了处方的病人没有好好按照处方吃药，而不是处方没开

Generally, SUBJECT + V. + COMPARATIVE should not be followed that or those.
Incorrect: The company had higher profits in 1990 than those in 1980.
Correct: The company had higher profits in 1990 than in 1980.

比1994的人数多30%,设1994总人数t 40%t拥有电脑人数, 40%t*(100%+30%)=52%t 1998拥有电脑人数 52%t/(100%+4%)t=50%

Mark-kate=108-18=90

equipped to + VERB (Our new car is equipped to drive in icy conditions.)
equipped for + NOUN (My family is well equipped for a tornado.)
(E) appeared to have been equipped for facing any obstacle the environment could put in their path,
This is INCORRECT because it uses a verb after "equipped for," when the rule states that it can only be followed by a noun.

"which" refers to the closest noun before it: "exhibit." But then the sentence would say that the exhibit "thereby activates the animated functions..." That's not true; the exhibit does not activate the functions, the visitor does.

1. The phrase “festival’s month” is not idiomatic. It gives the meaning that the festival possesses the month. When referring to an inanimate object, we must avoid possessive. This expression should be “the month of the festival”.
2. Here, the expression “in that” means “because”. In this case, ‘because’ is preferred since it is more concise and gives the meaning directly. Note that ‘for’, which is used in the correct option, also means because.

E的比较对象不对等，应该用The cost of running nuclear plants is about the same as that of other types of power plants。

since表因为，跟consequently连用赘余
because 和 as a result 也赘余
from where的表达是错误的，要么直接用where，要么用from which

所以G&S消费和中级消费是两码事....X国有更低的GS消费和更高的中级消费. 选项D中,房子和交通和育儿都属于GS消费?

这成绩是不是不准……

Having Been creates a timeline in the past which refers that Action A happens before Action B in the past.
Here it means -
Naming the mythological Nymph------------Discovery of the asteroid named IDA.
所以命名的这个action是早于主语中的发现discovery 的action
做这种三明治的句子，要整理时间的顺序，并且找到句子的core
可以看出来B选项是按照逻辑顺序从过去到现在来构句的： 首先是1884年被发现，再被命名，再是表述Ida 星是处在太阳和火星、木星绕着的星云带中间。
这样两个modifiers 按照时间顺序在前，句子的core 在后。