1) C项的时态would有问题，而且wordy

Idiom: be geared to/toward sth = 使为…而准备；使为了达到…而作好准备
Parallelism: 1) toward A and B not toward A and B; 2) action noun and gerund (without "the") are not in parallel.

for option A, "on Columbus Day 1992" modifies "arrive" instead of "pledge".

verbs take ONLY the command subjunctive when indicating desire:
demand, dictate, insist, mandate, propose, recommend, request, stipulate, suggest;
verbs take ONLY the infinitive:
advise, allow, forbid, persuade, want

The COMMAND subjunctive can also be used with nouns derived from bossy verbs, such as a demand or a request:
Right: His demand THAT he BE paid full severance was not met.

如果N-1能被2整除但不能被4整除，那N+1肯定可以被4整除；反之亦然。

（1）Sn=a1+a2+a3+...+an(公比bai为q)

（2）qSn=a1q + a2q + a3q +...+ anq = a2+ a3+ a4+...+ an+ a(n+1)

（3）Sn-qSn=(1-q)Sn=a1-a(n+1)

（4）a(n+1)=a1qn

（5）Sn=a1(1-qn)/(1-q)（q≠1) 

(1) We cannot infer that [all red or blue balls have even integers] from that [all white balls have odd integers].

five different integers
#把题干数学化#

根据条件一； 则有设十位数为x, 个位数为b*x, b为x 的倍数， 则 n = 10x+ bx =x(10+b),有因数 x 和 10+b， 肯定为大于1 的非质数；
根据条件二， n 可为 22（合数）； 23（质数）； 无法判断
故答案为A

an isolation that limited both cultural contact and exposure to European diseases, limit 不是减少

逻辑关系：温度降至-78°C以下，臭氧洞形成；-->今年测了几次不同的时间都发现臭氧洞小了；-->但这不并不能证明臭氧洞正在恢复。
ABC都无关；E 反应不出这个逻辑关系，这个逻辑关系的核心是：“洞突然变小”，而D正好解释了个这个关系-->有某些温室气体混入（温室气体混入-->导致温度上升-->暂时性地影响了今年的臭氧洞的形成）

重复排列问题，可以重复的放下面，不重复的放上面，eg：3封信放5个信箱 为 5^3； 4个人搭6艘船 6^4； 本题为3个雇员，2个办公室： 2^3 =8 种（D）

that 指代 animals, plural --> exhibit (a)(b) eliminated

inadequate to answer != not support

这题做了9:40。
把握原则：先找特殊值，再证明。

sequence: 数列
consecutive integers: （递增的）连续整数

total fee = processing+shipping

Given that n is an integer, n should be positive as n>-1 and np>0.

E选项 the last day that they are scheduled to collect指的是他们要去收集day，不符合逻辑

1) bring A with B = bring with B A; which 指代最近的名词，排除AB
2) 倒装句动词形式由实际的主语决定，排除A+D
3) 代词it指代empire，不符合逻辑，排除E.