为了帮助同学们顺利备考5月21日预测的内容，并且题目后面也有相应的答案及解析资料，下面就来认真分析一下吧，希望可以帮助到你们。
1.In the solar system, collisions among the planets are among the most_____ processes shaping surfaces: many a picture of the planets in it show that a proliferation of impact craters happened in the last 4 to 5 billion years.
A. cataclysmic
B. pervasive
C. misleading
D. clairvoyant
E. vivacious
答案：E
解析：在太阳系中，行星碰撞形成的表面是最_____过程之间：在这行星的图片显示，增殖许多陨石坑发生在过去4到5000000000年。A.激变 B.普适 c.误导 D.透视 E.活泼,通过后半句的年份可以看出其实是想体现过程的缓慢，也就是说最快的过程也需要非常久的时间，答案选E。
2.Researchers in University of Maryland discover that many people subconsciously think that in assessment of others competence and warmth are (i) ____: when they feel someone is highly capable, they will assert that he or she must have a tendency to be (ii) ______.
Blank (i) Blank (ii)
A. clearly interconnected D. passive
B. inversely related E. nonchalant
C. physically paralyzed F. unfeeling
答案：BE
解析：A显然是相互联系的 D.消极的
B成反比 E.漠不关心的
C肢体瘫痪 F.没有同情心的
可以看出i为B，ii为E，答案符合逻辑。
3.View people as "social atoms" that obey rather simple rules (which are not unlike the laws of physics), we may discover certain patterns, or "(i) ________"Buchanan illustrates the approach with a very simple example: the way channels emerge when people move in crowds. In the midst of initially (ii) _______ movements, one person begins to follow another in an effort to avoid collisions, and streams of movement emerge. As more people join such streams, there is greater pull on others to join in the flow, and the particular channels become (iii) _____.
Blank (i) Blank (ii) Blank (iii)
A. law-like regularities D. clear G. self‐perpetuating
B. regular cases E. tranquil H. self-defacing
C. convoluted disorders F. chaotic I. self-sufficient
答案：AFG
解析：人们行为有固定模式或(i)_____，比如说一开始大家都(ii)_____移动，然后一个人开始跟着另一个人走以免碰撞，然后就出现了通道。随着更多人参与进来，通道就变得(iii)_____
空白(i) 空白(ii) 空白(ii)
A法规 D.清楚的 G.能使自身永久存在的
B.常例 E.平静的 H.自我丑化的
C.紊乱 F.混乱的 I.自给自足的
在空白(i)中要选择“固定模式”的同义词，所以选择A。在空白(ii)中要说一开始是没有通道的，所以选择F。在空白(ii)中要说通道会一直存在着，所以选择G
4.The eccentric Canadian Prime Minister, Mackenzie King, often used stances to contact his dead pet dog for advice; despite this ____ behavior, the public had so much confidence in his ability as a leader that he was in power for 22 years.
A. capricious
B. lackluster
C. poised
D. unconventional
E. repulsive
F. decorous
答案：AD
解析：这道题是说人们还是很相信加拿大总理的领导能力，虽然古怪的他会有向死去的宠物狗咨询的____行为。
A.任性无常 B.平凡 C.镇定 D.非传统 E.令人厌恶 F.稳重端庄
这里要对应“古怪的”，所以选择A.D.
5.The circulation of the blood makes human adaptability to the _____ conditions of life, such as fluctuating atmospheric pressure, level of physical activity, and diet, possible.
A. inveterate
B. dynamic
C. timorous
D. cowed
E. turgid
F. oscillating
答案：BF
解析：这道题是说血液循环让人们适应_____的生活条件，比如说波动的大气压力，不同的体力活动以及饮食。
A.根深蒂固的 B.动态的 C.胆怯的 D.受到恐吓的 E.晦涩难懂的 F.浮动的
这里要对应“波动的”，“不同的”，所以选择B.F.
今天网整理的内容就是2017年5月21日GRE填空机经预测，希望可以帮助到大家备考GRE填空。