填空模拟题

41. Many subatomic nuclear particles are ______ and nearly ______ : they are hard to track as well as to detect.
A. unstable, explosive
B. elusive, imperceptible
C. minute, immobile
D. charged, reactive
E. tenuous, indivisible

42. The crafty child tricked his innocent brother, a particularly ______ and trusting boy, into committing a mischievous prank.
A. guileless
B. intrusive
C. astute
D. opportunistic
E. circumspect

题意解析及中文释义

题意解析及中文释义：

41.
题意解析：
冒号提示上下句重复，下文讲亚原子核粒子难以跟踪和难以探测，直接在两空中填入跟踪和探测的反义词即可，选择B。
中文释义：
许多亚原子核粒子是规避性的且几乎无法察觉：它们是难以跟踪和探测到的。

42.
题意解析：
分隔中填入一词来修饰男孩子，前文可知其是innocent（单纯的），故空格填入单纯的同义词即可，选择A。
中文释义：
狡猾的男孩欺骗了他单纯的兄弟——一个特别单纯易相信别人的男孩子——去承担恶作剧的后果。