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Now listen to the following recording and answer questions 20 to 22.

A. To start the school earlier.
B. To improve the lives of children.
C. To stop children from using cell phones.
D. To put back school start times.

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Now listen to the following recording and answer questions 16 to 19.

A. The executive supervisor of Human Resources.
B. The senior vice president of Marketing Management.
C. The senior director of International Client Group.
D. The executive vice president of Human Resources.

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Now listen to the following recording and answer questions 20 to 22.

A. Body clock.
B. Education quality.
C. Mobile device.
D. Life quality.

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设总体X具有分布率 X123Pkθ22θ(1-θ)(1-θ)2 其中θ(0＜θ＜1)为未知参数。已知取得样本值x1=1，x2=2，x3=3，求θ的矩估计值和最大似然估计值。

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在xOy坐标平面上，连续曲线L过点M(1，0)，其上任意点P(x，y)(x＞0)处切线斜率与直线OP的斜率之差等于x。 (Ⅰ)求L的方程； (Ⅱ)L与x轴所围成区域绕x轴旋转一周所成的体积。

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Now listen to the following recording and answer questions 20 to 22.

A. To start the school earlier. B. To improve the lives of children. C. To stop children from using cell phones. D. To put back school start times.

Now listen to the following recording and answer questions 16 to 19.

Now listen to the following recording and answer questions 20 to 22.

设总体X具有分布率 X123Pkθ22θ(1-θ)(1-θ)2 其中θ(0＜θ＜1)为未知参数。已知取得样本值x1=1，x2=2，x3=3，求θ的矩估计值和最大似然估计值。

在xOy坐标平面上，连续曲线L过点M(1，0)，其上任意点P(x，y)(x＞0)处切线斜率与直线OP的斜率之差等于x。 (Ⅰ)求L的方程； (Ⅱ)L与x轴所围成区域绕x轴旋转一周所成的体积。

A. To start the school earlier.
B. To improve the lives of children.
C. To stop children from using cell phones.
D. To put back school start times.