单项选择题

猪是恒温动物,正常情况下,体温保持在( )℃范围内,大猪怕热,小猪怕冷,不同阶段的猪群,不同的硬件设施,猪只的最适生长温度、能耐受的最高温度和最低温度不同。 A.
38.5--39.7 B.
36.5--37 C.
39.7--41.7 D.
40--42.7

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D.dark
A.light
B.fresh
C.dim
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Many teachers believe that the responsibilities for learning lie with the student.【C1】______a long reading assignment is given, instructors expect students to be familiar with the【C2】______in the reading even if they don't discuss it in class or take an exam. The【C3】______student is considered to be【C4】______who is motivated to learn for the sake of【C5】______, not the one interested only in getting high grades. Sometimes homework is returned【C6】______brief written comments but without a gradE.Even if a grade is not given, the student is【C7】______for learning the material assigneD.When research is【C8】______, the professor expects the student to take it actively and to complete it with【C9】______guidancE.It is the【C10】______responsibility to find books, magazines, and articles in the library. Professors do not have the time to explain【C11】______a university library works; they expect students,【C12】______graduate students, to be able to exhaust the reference【C13】______in the library. Professors will help students who need it, but【C14】______that their students should not be【C15】______dependent on them. In the United States, professors have many other duties【C16】______teaching, such as administrative or research work.【C17】______, the time that a professor can spend with a student outside of class is【C18】______If a student has problems with classroom work, the student should either【C19】______a professor during office hours【C20】______make an appointment.【C1】A.IfB.AlthoughC.BecauseD.Since
A.【C1】______a
B.【C17】______,
C.
【C1】
A.If
B.Although
C.Because