C：approach has not answered questions of 【whether biological life forms ever emerged on Mars】 and 【whether, presuming such life forms left fossil traces to begin with, those traces still exist in some moist recesses of the cold and arid planet.】✔
#whether those traces still exist in some moist recesses of the cold and arid planet.#
A：approach has not answered questions of 【whether biological life forms ever emerged on Mars】 and 【whether, presuming such life forms having left fossil traces to begin with, those traces can still exist in some moist recesses of the cold and arid plane.】
having left❌
can 重复

【The steel industry has changed radically over the last two decades】【主句】
, as large, integrated 【companies】【S】 such as Bethlehem Steel 【这里必须加that】once conducted operations from mining at one end of the process to shipping at the other
【have greatly downsized】【V】, or in some cases shut down altogether.

——语法——
1）虚拟语气-B
on condition that they not be named✔
on condition that their names will not be used❌

——句意——
1）gerund&noun-A
indicate a child's acquiring language, thinking, and emotional skills as an active process.儿童获取语言等技巧（具体会做）❌
indicate that a child's acquisition of language, thinking, and emotional skills is an active process.儿童获取语言等技巧（somehow参与其中，未提及具体subject）✔
2）主干错误-B
new findings that are indicative.意为：新的发现是具有象征性的❌
3）To do & doing-C
conference on new findings to indicate：开有关新发现的会，这个会导致了新发现揭示了某某事实❌
conference on new findings indicating：开有关新发现的会，新发现揭示了某某事实✔
——语法——
1）形容词做名词定语时，必须前置于名词-E
conference on new findings indicative of a child's acquisition of language, thinking, and emotional skills……❌

这个月先立一个小目标，GMAT700+~

这个解析解了跟没解一样

——句意——
1）比较错误
A：Laos has a land area about the same as 【Great Britain】❌
2）并列错误
B：Laos has a land area of about the same size as Great Britain is, but 【in Laos there is a population of only four million】, and 【many are members of hill tribes ensconced in the virtually inaccessible mountain valleys of the north】 ❌ and并列的很不合理
D：but 【only four million in population】, and 【many are members of hill tribes ensconced in the virtually inaccessible mountain valleys of the north】❌
3）主语缺失
C：Laos has a land area that is about the same size as Great Britain's land area, but 【in Laos with a population of only four million people, many of them are members of hill tribes ensconced in the virtually inaccessible mountain valleys of the north】❌没有主语后半句
4）正确转折
E：Laos 【has a land area comparable to that of Great Britain】 but【(has) a population of only four million people】, many of whom are members of hill tribes ensconced in the virtually inaccessible mountain valleys of the north.✔

——句意——
1）比较错误
D：would 【have to know】 a great deal more than 【they do now】 about the social and economic，比较对象为【不同时间下的两件事】✔
E：would 【have to know】 a great deal more than 【now】 about the social and economic，比较对象为时间❌
由于前句没有时间状语，后句只能被理解成为【now】，而并不能理解为【省略了谓语动词】

——句意——
1）主语错误
A、B：句意均为“我arguing……”❌
应该为“Discourse arguing……”
2）平行错误
C、D：equal political and legal rights and for changes in the married women's property laws❌
E：句意里应该平行的是a treatise that argued 【for equal political and legal rights for women】and【for changes in the married women's property laws】✔

——句意——
1）主语错误
A：at some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation.
意思为：我们的祖先减少了他们的数量和基因变异❌
E：some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly, and thus our genetic variation.
句意为：我们的祖先减少了他们的数量和基因变异❌
2）and 前后并不平行
C：that some time in the past our ancestors suffered an event so that their numbers were greatly reduced, and thus our genetic variation.❌
D：some time in the past our ancestors suffered an event from which their numbers were greatly reduced and thus our genetic variation.❌

meidan的概念是互斥不重复，所以只有1，2，3，7，8这五个数在集合里

做了这么多题 第10题太怪了

介词+which引导的定语从句中必须有主语

题目说了是earthquake known to have occurred near the island in A.D. 365.，所以地震一定发生了，要去验证的应该是destruction

在画数轴的时候一定要把x在左边和x在右边两种情况都画出来

一个公司的两个部门在过去的三年表现得很互补：制药部门占据了20%的销售额和40%的利润。同时化学药物部门弥补了剩下的份额（ 80%的销售额和60%的利润）
must be true:
choice c, 化学部门在每一美金的销售额上实现的利润，要低于制药部门每一美金销售额实现的利润。
choice e, 高利润药物在化学部门占了更高的比重，比起制药部门。-> opposite to the context

条件1不行的理由是这个素数可能已经被包含在20里了

这个人的逻辑链是因为人造脂肪会吸收人体必要的维他命，使得人体无法利用这些维他命，所以人们不应该吃人造脂肪。b的答案是说人造脂肪中是否含有维他命，人体能否利用维他命仍然未知。而a选项直接从根本上解决了这个问题，人体可以通过补充维他命来弥补这些被吸收的维他命，那么人体自然也就可以吃人造脂肪了

不是说‘s是用于有生命的人或动物使用的吗，为什么答案里的earth也可以用’s呢

——句意——
1）
ABC：representatives 【said】 and 【expected】❌
DE：representatives said 【that there were……】and 【that expected】✔
2）
expected the increase of piracy❌
expected piracy to increase✔