题目内容：

Astronauts on board the Shenzhou-10 spacecraft have taught a lesson from space to schoolchildren through a live video. The astronauts made some experiments in the lab Tiangong-1. They showed a lot of  physical(物理的) phenomenon（现象） in a zero-gravity（失重的） environment.

Greetings from space have opened a new history in China.

Wang Yaping, Shenzhou-10 Astronaut, said, "Hello, everyone. I am Wang Yaping. I will host the lecture today.” It is the country’s very first space lecture. And all eyes were on the female space teacher Wang Yaping and her two other partners.

The first part of the class was all about weight. This floating（漂浮的） pose looked like a pose from a Chinese Kongfu movie. Audiences were amazed by it.

Wang Yaping later did some other experiments to show what happens in zero gravity. She also did an experiment of what water is like on space.

In Beijing, about 330 students attended the class and ask questions of the astronauts from video calls.

Song Xinke said, "It’s very interesting. The experiment that impressed me a lot is the water balloon. The phenomenon is very beautiful. We have not learned enough knowledge to understand it. So I want to learn more after the class."

Liu Yuezhang said, "I feel very excited about this class. I have lots of questions and the astronauts are answering our questions. They teach us a lot of knowledge."

China’s very first lesson from space was a new chapter（篇章） in history. The experiment is sure to be a great encouragement for the young to            explore the unknown. And get a greater understanding of the universe.

任务一，根据短文内容回答问题。

1.Who have taught a lesson from space?

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2.How many students in Beijing attended the class and ask questions?

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任务二， 请将文中划线的句子翻译成中文。

3.___________________________________________

4.____________________________________________

5.文中划线词语的含义是：（   ）

A. 得到     B. 理解    C.目标    D.探索