C错，应该是as other reptiles can

C相当于drug is intended for use by both adults and children

错选E，因为看到原句有must，以为must是必要元素_(:з」∠)_就直接选了

however, "this" as an ADJECTIVE (the way in which it is used here, in front of the noun "vantage point") is just fine, and is quite exceedingly common.
晕死，gmat到底有没有常性了。。。
错选A，A.combining错误，应该为combined

法官本身没有问题

削弱题 法官的专断导致了方案无法顺利实施
因果联系
要么找它因/证明因果无联系

C选项，”how likely a particular asteroid or comet will be to“是宾语从句，从句的核心词是动词collide, 而实际上rate的对象自然不会是collide.
D选项，"for rating the likelihood"是scale的宾补，"that a particular asteroid or comet will"是同位语从句，用来修饰说明这个likelihood。语义正确合乎逻辑。
C和D还有to do和doing的区别：天文学家发明scale，但是rate这个动作未必由他们亲自完成，所以并没有强调施动者，故用doing而不是to do.

选项E解释牛逼

choice D
PROBLEM: The "up" is unnecessary. The present perfect tense starts in the past and continues into the present. But the use of "until recently" implies that this has stopped, so the present perfect doesn't work.
Remember that "recently", albeit not too long ago, is still a time in the past.

However, scientists have failed to devise an experiment to demonstrate both behaviors simultaneously.
同义替换

sporadic 零星的，分散的

思路
F认为专利可以促进经济发展 但是学者并不这样认为 因为他们觉得法官很专断很任性 并且举例子说明 第一段结尾说 然而后期 法官的态度改变了很多 这样的结论的原因是 比率上升
第二段削弱 比率上升不代表态度改变/后面的案子还是引用前面的 并且给出了上升的真正原因

undetermined 不确定的
he concluded that the physical of a quantum object is actually undetermined before the object is observed via experiment.

看第二段的解释1 样本不具有代表性 2 之后的会引用之前的 因此达到削弱的作用

this strategy would be advantageous because fewer animals would be necessary to maintain the genetic diversity of tigers in captivity, making scarce zoo resources available for housing other endangered felines.
取非+同义替换

white tigers are merely Indian tigers—a subspecies well represented in both zoos and the wild—and that zoos should focus their tiger management efforts on preserving subspecies whose existence is threatened
破折号内容常考+后面取非，很善良了

imply推断题一定要小心 有陷阱 理解透！！

population proporation

only 29 percent of the Swiss population lived in cities
取非+比较，同义替换

Within the United States prior to 1920, for example, only less urbanized states had granted women suffrage.
只有不是城市化最高的地区才有了woman suffrage