中国人民大学2017年考博英语真题

　　医学博士英语统一考试之后，即将迎来各院校的考博英语初试，英语考试的备考，参考历年真题是一个很重要的备考过程，今天新东方在线小编给大家整理了中国人民大学2017年考博英语真题，帮助大家更好的备考，考博英语考试，一起来看看吧!

全国院校考博英语历年真题汇总

　　Cells cannot remain alive outside certain limits of temperature, and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only within a narrow (21) around 37^ ;汪 (22) , of a few degrees from this value seriously impairs their functioning. Even though cells can survive wider (23) , the integrated actions of bodily systems are impaired. Other animals have a wider tolerance (24) changes of body

　　temperature.

　　For centuries (25) has been recognized that mammals and birds differ from other animals in the way they regulate body temperature. Ways of (26) the difference have become more accurate and meaningful over time, but popular terminology still reflects the old division (27) “ warm blooded ’’ and “ cold blooded ’’ species ; warm blooded included mammals and birds, (28) all other creatures were considered cold blooded. (29) more species were studied, it became evident that this classification was (30) • A fence lizard usually has a body temperature only a degree or two below (31) of humans and so is not cold. (32) the next distinction was made between animals that maintain a (33) body temperature and those whose body temperature varies with their environment. But this classification also proved inadequate, (34) among mammals there are many that vary their body temperatures during hibernation. (35) many invertebrates that live in the (36) of the ocean never experience a change in the chill of the deep water, and their body temperatures remain constant. The current distinction is between animals whose body temperature is (37) chiefly by internal metabolic processes and those whose temperature is regulated by the (38) The latter do so mainly by moving to favorable sites or by changing their exposure to (39) sources of heat. Mammals and birds also regulate their

　　temperature by choosing favorable environments, but primarily they regulate their temperature by making a variety of internal (40) .

　　21. A. scope B. range C. scale D. field

　　22. A. difference B. change C. gap D. departure

　　23. A. change B. gap C. fluctuation D. increase

　　24. A. between B. for C. with D. around

　　25. A. they B. it C. we D. what

　　26. A. measuring B. understanding C. characterizing D. charting

　　27. A. into B. of C. by D. with

　　28. A. however B. whereas C. with D. though

　　29. A. With B. Like C. As D. Being

　　30. A. wrong B. false C. sufficient D. inadequate

　　31. A. which B. that C. what D. much

　　32. A. But B. However C. Therefore D. Meanwhile

　　33. A. warm B. constant C. stable D. cold

　　34. A. due to B. because C. because of D. and

　　35. A. However B. On the other hand C. Furthermore D. For example

　　36. A. bottoms B. lengths C. depths D. darkness

　　37. A. decided B. regulated C. controlled D. changed

　　38. A. body B. water C. environment D. skin

　　39. A. various B. external C. environmental D. exterior

　　40. A. adjustments B. compensations C. regulations D. arrangements

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