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【单选题】
地球上瑰丽的生命画卷，在常人看来是芸芸众生，千姿百态。但是在生物学家的眼中，它们却是富有层次的生命系统。下列各组合中，能体现生命系统的层次由简单到复杂的正确顺序是①肝脏 ②血液 ③神经元④蓝细菌 ⑤细胞内各种化合物 ⑥病毒⑦同一片草地上的所有山羊 ⑧某池塘中的所有鱼 ⑨一片森林⑩某农的所有生物
A.
⑤⑥③②①④⑦⑩⑨
B.
③②①④⑦⑩⑨
C.
③②①④⑦⑧④⑨
D.
⑤②①④⑦⑩⑨
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】In a purely biological sense, fear begins with the body’’s system for reacting to things that can harm us—the so-called fight-or-flight response. "An animal that can’’t detect danger can’’t stay alive...
A.
reactions of humans and animals to dangerous situations are often unpredictable
B.
memories of significant events enable people to control fear and distress
C.
people’’s unpleasant memories are derived from their feelings of fear
D.
the amygdala plays a vital part in human and animal responses to potential danger