问题补充：
Among the crises that face humans the lack of natural resources.
A. is
B. are
C. is there
D. are there
答案：
(答案→)A. is
B. are
C. is there
D. are there
解析：根据句子结构可知，该句为完全倒装句。用法为，表示方式或方位的副词或介词短语放句首（该句中为(among the crises that face humans) ，句子要使用完全倒装，即把谓语动词提前到主语之前。由此可知，该句的主语为the lack of natural resources单数，句子本来应为The lack of natural resources is among the crises that face humans. 因此选择B项，句意为，缺少自然资源是人类面临的众多危机之一。
【考点定位】考察倒装句。
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