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【单选题】
From the conversation, we know that a cluster diagram always includes _______.
A.
topic sentence, evidences, explanation for each
B.
topic sentence, explanation, conclusion
C.
topic sentence, data ysis, explanation
D.
topic sentence, evidences, conclusion
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参考答案：
举一反三
【单选题】设$f(x) = \left\{ \begin{array}{l} 2{{\rm{e}}^{x - 1}}{\rm{, }}\qquad\quad \;\;x < 2, \\ {\log _3}({x^2} - 1),{\rm{ }}\quad x \ge 2, \\ \end{array} \right. $, 则$f(f(2)) = $( ).
A.
0
B.
1
C.
2
D.
3
【单选题】设随机变量\(X\)的概率密度函数\(\phi(x)=\frac{1}{\pi(1+x^2)}\)，求随机变量\(Y=aX^2,(a < 0)\)的概率密度函数\(f(y)\)
A.
\[ f(y)=\left\{ \begin{aligned} -\frac{1}{\pi(a+y)}\sqrt{\frac{a}{y}} &,& y < 0 \\ 0 &,& y \geq 0 \end{aligned} \right. \]
B.
\[ f(y)=\left\{ \begin{aligned} -\frac{1}{\pi(a+y)}\sqrt{\frac{a}{2y}} &,& y < 0 \\ 0 &,& y \geq 0 \end{aligned} \right. \]
C.
\[ f(y)=\left\{ \begin{aligned} -\frac{1}{\pi(a+y)}\sqrt{\frac{a}{2y}} &,& y > 0 \\ 0 &,& y \leq 0 \end{aligned} \right. \]
D.
以上答案均不正确
【单选题】设离散型随机变量\(X\)的分布函数为\[ F(x)=\left\{ \begin{aligned} 0 &,& x < -1 \\ 0.4 &,& -1 \leq x < 1 \\ 0.8 &,& 1 \leq x < 3\\ 1 &,& x \geq 3 \end{aligne...
A.
\(\frac{1}{3}\)
B.
\(\frac{2}{3}\)
C.
\(\frac{4}{5}\)
D.
以上答案均不正确
【单选题】设$f(x) = \cos x, f(\varphi (x)) = 1 - {x^2}$, 则$\varphi (x) $的定义域是( ).
A.
$(-\infty,+\infty) $
B.
$[-\sqrt{2},\sqrt{2}] $
C.
$[-1,1] $
D.
$[0,{\rm{\pi }}] $
【单选题】According to Alex, where should the topic sentence appear in the paragraph?
A.
any where
B.
the last sentence
C.
the middle of the paragraph
D.
the beginning of the paragraph
相关题目：
【单选题】设$f(x) = \left\{ \begin{array}{l} 2{{\rm{e}}^{x - 1}}{\rm{, }}\qquad\quad \;\;x < 2, \\ {\log _3}({x^2} - 1),{\rm{ }}\quad x \ge 2, \\ \end{array} \right. $, 则$f(f(2)) = $( ).
A.
0
B.
1
C.
2
D.
3
【单选题】设随机变量\(X\)的概率密度函数\(\phi(x)=\frac{1}{\pi(1+x^2)}\)，求随机变量\(Y=aX^2,(a < 0)\)的概率密度函数\(f(y)\)
A.
\[ f(y)=\left\{ \begin{aligned} -\frac{1}{\pi(a+y)}\sqrt{\frac{a}{y}} &,& y < 0 \\ 0 &,& y \geq 0 \end{aligned} \right. \]
B.
\[ f(y)=\left\{ \begin{aligned} -\frac{1}{\pi(a+y)}\sqrt{\frac{a}{2y}} &,& y < 0 \\ 0 &,& y \geq 0 \end{aligned} \right. \]
C.
\[ f(y)=\left\{ \begin{aligned} -\frac{1}{\pi(a+y)}\sqrt{\frac{a}{2y}} &,& y > 0 \\ 0 &,& y \leq 0 \end{aligned} \right. \]
D.
以上答案均不正确
【单选题】设离散型随机变量\(X\)的分布函数为\[ F(x)=\left\{ \begin{aligned} 0 &,& x < -1 \\ 0.4 &,& -1 \leq x < 1 \\ 0.8 &,& 1 \leq x < 3\\ 1 &,& x \geq 3 \end{aligne...
A.
\(\frac{1}{3}\)
B.
\(\frac{2}{3}\)
C.
\(\frac{4}{5}\)
D.
以上答案均不正确
【单选题】设$f(x) = \cos x, f(\varphi (x)) = 1 - {x^2}$, 则$\varphi (x) $的定义域是( ).
A.
$(-\infty,+\infty) $
B.
$[-\sqrt{2},\sqrt{2}] $
C.
$[-1,1] $
D.
$[0,{\rm{\pi }}] $
【单选题】According to Alex, where should the topic sentence appear in the paragraph?
A.
any where
B.
the last sentence
C.
the middle of the paragraph
D.
the beginning of the paragraph
参考解析：
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