25.The author's hypothesis concerning be cold prehistory of life would be most weakened if which of the following were true?

　　(A)Cosmic rays are unlikely to trigger the formation of simple molecules.

　　(B)Tunneling occurs only in a narrow band of temperatures around zero degrees Kelvin.

　　(C)The synthesis of interstellar formaldehyde can be activated by means other than cosmic rays.

　　(D)Simple molecules can be synthesized by means of tunneling.

　　(E)Classical chemical reactions do not occur at temperatures close to absolute zero.

　　26.Which of the following best describes the hypothesis of Hoyle and Wickramasinghe as it is presented in the passage?

　　(A) Cosmic rays can directly synthesize complex organic molecules.

　　(B) The galactic clouds are the places where prebiological evolution of compounds necessary to life occurred.

　　(C) Interstellar formaldehyde can be synthesized by tunneling.

　　(D) Molecules of interstellar formaldehyde can evolve into complex organic molecules.

　　(E) Complex organic molecules can be synthesized from stable polysaccharides such as cellulose and starch.

　　27.Which of the following best describes the organization of the first two paragraphs of the passage?

　　(A) The author cites a basic principle of classical chemistry and then describes the research from which that principle was developed.

　　(B) The author cites an apparent contradiction to the principles of classical chemistry and then explains the process of a chemical reaction to show there is in fact no contradiction.

　　(C) the author describes the role of heat in chemical reactions and then offers a detailed explanation of its function.

　　(D) The author presents a law of classical chemistry in order to introduce a kind of chemical reaction that differs from it and then explains the essential difference between the two.

　　(E) The author presents the fundamental rules of classical chemistry in order to introduce an explanation of a specific chemical reaction.

　　28. PREFACE：

　　(A) improvisation

　　(B) burlesque

　　(C) epilogue

　　(D) tangent

　　(E) backdrop

　　29. DEBILITATE：

　　(A) implicate

　　(B) invigorate

　　(C) obfuscate

　　(D) realign

　　(E) encumber

　　30. TASTY：

　　(A) uninteresting

　　(B) unfamiliar

　　(C) unexpected

　　(D) understated

　　(E) undervalued

　　31. ABNEGATE：

　　(A) refresh

　　(B) reaffirm

　　(C) relieve

　　(D) react

　　(E) reform

　　32. SERRIED：

　　(A) partially formed

　　(B) widely separated

　　(C) narrowly missed

　　(D) extremely grateful

　　(E) reasonably clean

　　33. BOMBASTIC：

　　(A) unflappable

　　(B) uninspired

　　(C) unpretentious

　　(D) inscrutable

　　(E) incisive

　　34. BANAL：

　　(A) comfortable

　　(B) novel

　　(C) equal

　　(D) fatal

　　(E) competent

　　35. LANGUISH：

　　(A) agitate

　　(B) wander

　　(C) relieve

　　(D) discomfit

　　(E) thrive

　　36. ENNUI：

　　(A) intimidation

　　(B) sleaze

　　(C) faint recollection

　　(D) keen interest

　　(E) deep reservation

　　37.DAUNTLESS：

　　(A) sophomoric

　　(B) trifling

　　(C) pusillanimous

　　(D) specious

　　(E) parsimonious

　　38.TEMERITY：

　　(A) credibility

　　(B) authority

　　(C) celebrity

　　(D) acrimony

　　(E) circumspection