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【单选题】
用于预应力混凝土结构中要求混凝土强度等于一般不低于()。A.
C25
B.
C30
C.
C40
D.
C45
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反馈参考答案：
举一反三
【单选题】The principal purpose of this passage is to______.
A.
criticize the government
B.
argue for the value of the death penalty
C.
speak for the majority
D.
initiate a veto
【简答题】已知函数f（x）=a- （x∈R）， （1）证明：对于任意的a∈R，f（x）是R上的增函数； （2）是否存在实数a使函数f（x）为奇函数？若存在，请求出a的值，若不存在，说明理由。
【单选题】What is th purpose of napkin?
A.
To clean your nose.
B.
To dust the chair.
C.
To blot your mouth.
【简答题】简述广告文案写作注意事项。
【单选题】The purpose of this article is to______.
A.
ware us of the wickedness of napping
B.
explain the danger of sleepiness
C.
discuss the side effects of napping
D.
convince the reader of the necessity of napping
【简答题】简述广告文案写作注意事项
【单选题】The purpose of the experiment introduced in the last paragraph is______.
A.
to prove that the chimps are not self-recognitive
B.
to prove that the chimps have the ability to remember their own appearance
C.
to prove that the chimps have realized that the figures they see in the mirror are themselves
D.
to prove that the chimps are non-human
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