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Listen to a talk about an environmental problem on Mount Qomolangma and choose the best answer to each of the questions.2. Why did China close its base on Mount Qomolangma?[音频]

A. The bad weather made it dangerous for climbing.
B. The amount of waste was harming the environment.
C. There was a lack of volunteers to guide the climbers.
D. The base could not provide food for so many climbers.

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Listen to a talk about an environmental problem on Mount Qomolangma and choose the best answer to each of the questions.3. What is Nepal’s solution to the environmental problem?[音频]

A. Limiting the number of climbers each day.
B. Limiting the waste each climber can produce.
C. Asking climbers to pay a deposit before they go up.
D. Asking the climbers not to produce any waste while climbing.

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将四个不同颜色的乒乓球随机放入编号分别为1，2，3，4的四个盒子中（每个盒子足够大）．（1）求编号为1的盒子为空盒的概率；(用“/”表示)（2）求空盒的个数ξ的分布列和数学期望E（ξ）．(用“/”表示)

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已知X服从B（10，0.1），计算E（2X+1）=

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SEO工作的三个核心要素是什么？

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Listen to a talk about an environmental problem on Mount Qomolangma and choose the best answer to each of the questions.2. Why did China close its base on Mount Qomolangma?[音频]

A. The bad weather made it dangerous for climbing. B. The amount of waste was harming the environment. C. There was a lack of volunteers to guide the climbers. D. The base could not provide food for so many climbers.

Listen to a talk about an environmental problem on Mount Qomolangma and choose the best answer to each of the questions.3. What is Nepal’s solution to the environmental problem?[音频]

将四个不同颜色的乒乓球随机放入编号分别为1，2，3，4的四个盒子中（每个盒子足够大）．（1）求编号为1的盒子为空盒的概率；(用“/”表示)（2）求空盒的个数ξ的分布列和数学期望E（ξ）．(用“/”表示)

已知X服从B（10，0.1），计算E（2X+1）=

SEO工作的三个核心要素是什么？

A. The bad weather made it dangerous for climbing.
B. The amount of waste was harming the environment.
C. There was a lack of volunteers to guide the climbers.
D. The base could not provide food for so many climbers.