20. In line 54. "appreciate" most nearly means 词汇题

　　(A) enjoy

　　(B) recognize

　　(C) grateful

　　(D) greatly admire

　　(E) rapidly value

　　21. The answer to "both questions" (lines 57-58) is significant because it indicates that

　　(A) scientists have historically been trained to ask questions that have multiple right answers

　　(B) the nature of electrons is no longer in question

　　(C) scientific conclusions are shaped by the queries posed in experiments

　　(D) scientists, like artists, attempt to depict events realistically

　　(E) scientists need to pursue extensive research before they can come to valid conclusions

　　分析：原文表达对于科学结论的拥护

　　22. The claim that "the brain is no monolith" (lines 58-59) most nearly means which of the following? 推理题

　　(A) Human intelligence is ultimately limited.

　　(B) The brain consists of immense numbers of distinct structures.

　　(C) There are multiple ways in which each of us can perceive the world.

　　(D) The human brain is still baffling to scientists.

　　(E) Representing the human brain accurately will require additional research.