这道题的条件二也是成立的，做的时候忽略了题目说了，y是整数，所以如果y是整数的话，x只能小于零的整数。

把条件一化简得出k is divisible by 2，不成立，因为k可以被2整除，不能代表k能够被4整除；把条件二化简得出3k is divisible by 4，我们现在把原条件k／4 上下同乘以3得出 3k／12，所以根据条件二得出，3k可以被4整除，那证明k肯定有一个约数是4，所以3k可以整除12.

Draw a number line for x+ y < 73/ 72 and x +y < 1

Then you will see that as we found that x+ y < 73/ 72

At the interval 1 =< x+ y < 73/ 72 we can not conclude that x +y < 1

有（1）单独不充分，但可以得出只要其中任何一个乘数等于零，式子就会等于零。
由 （2）得出， bc不等于零
所以联立起来，可以得出a-7=0. 所以a=7

很难讲A指代的就是language, 而C就是指代的nature, 因为A中的language也是在所有格定语中，这个解释会不会稍微有点牵强？C选项的错误点是不是应该把has revealed not...改成has not revealed...

E：应该是宾语从句吧，这样才能省略关系词that啊.....

mark

A时态错，C中experiment应为主句动词，DE图形背景原则

选项C rampant 如何修饰动词？

如何辨析选项B和选项C

还是不太懂，题目最后一句话不是说在colson之后，开起来的都是非折扣店吗，这里B说开起来的都是折扣店，不会矛盾吗？

A不可以和最开始的那个with并列么

from which derive both the n and the s , 倒装

E：the real problem with choice e involves clarity: 'the last day that they are scheduled to collect' means, literally, that the workers collect days＇

为什么D不对啊

我有一句MMP……

when you use the word 'including', you have to use it was singular/plural according to the quantities of whatever it refers to. in this case, there is clearly more than one archaeologist / treasure hunter / sport diver, so you'd have to say '...including archaeologists, treasure hunters, and sport divers'.

to decide, look no further than the 'which' in choice a, which is followed by the verb 'exposes'. that verb is singular, indicating that 'which' must refer to something singular - and there are no singular nouns in that part of the sentence at all. ('whether they be' is also unnecessarily wordy.)