1. Among the Meakambut people of Papua New Guinea, legends are associated with specific caves in the Sepik region, and these legends are _____: only the cave owner can share its secrets.
A. impenetrable
B. immutable
C. proprietary
D. didactic
E. self-perpetuating
解析：冒号后面的 only the cave owner can share its secrets 说明这些传说是专属于洞穴主人的，所以正确答案选 C选项。proprietary所有者的。
翻译：在Papua New Guinea 的Meakambut 民族中，传说是和一些在 Sepik地区的特定洞穴有联系的，而且这些传说是专属的：只有洞穴的主人能够享有它的秘密。
2. We often regard natural phenomena like rainfall as mysterious and unpredictable; although for short time spans and particular places they appear so, in fact on a truly global scale, nature has been a model of _____.
A. reliability
B. diversity
C. complexity
D. plasticity
E. discontinuity
解析：根据 although 推知空格是选前面 mysterious and unpredictable 的反义，那么正确答案选 A选项。reliability 准确性。
翻译：我们经常将自然现象，比如降雨，视作神秘而又难以预测的，尽管对于很短的一段时间喝空间内来说是这样的，但实际上对于整个的全球范围来说，自然一直是以可靠的模式运行。
3. The economic recovery was somewhat lopsided: (i)_____ in some of the industrial economies
while(ii)_____ in others of them.
解析：lopsided 可知前后空格反义，所以在选项中能够选出 BD 选项。feeble虚弱的，robust 强壮的。
翻译：经济复苏开始变的有点不平衡。有些工业产业十分无力，但另一些却在迅速崛起。
4. Although trains may use energy more (i)_____ than do automobiles, the latter move only when
they contain at least one occupant, whereas railway carriages spend a considerable amount of time running up and down the tracks (ii)_____, or nearly so.
解析：前后取反，the latter move only when they contain at least one occupant
说明汽车上座率比火车高，所以第二空选 D选项，第一空根据逻辑推出要说火车比汽车好的地方，所以第一空选 B选项。efficiently
高效地，vacant空的。
翻译：尽管火车比汽车要更剩能量，后者在只要有至少一个人有需求时就可以行动，但火车的车厢却需要空着花费很长时间在铁轨上运行。