Space suits don’t just make astronauts ________ cool. Without these special suits, astronauts can’t ________ their spaceship. That is to say, they won’t ________ able to walk on the ________ or work outside the International Space Station.

★________ do astronauts need to wear space suits?

Space is a ________ place for people. Firstly, there is no air to breathe. ________ space also has high levels of radiation （辐射）that can pass ________ our bodies and make us sick. Thirdly, some parts of space are really ________ while other parts are very hot. So astronauts may die in just a few seconds if they go outside their spacecraft without ________ suits. With a space suit, astronauts can move around in ________ for several hours.

★What can a space suit do for an astronaut?

Space suits keep astronauts safely sealed （密封的）inside. A backpack sends O₂ in to let astronauts breathe ________. At the same time, the CO₂ that astronauts breathe out is sucked away （吸走）. The suit also ________ them from harmful radiation and fast-moving space dust. Under the space suit is ________ suit that looks like a pair of pajamas （睡衣）with little pipes （管子） running through them. Water runs through these pipes to ________ astronauts because wearing a space suit can make astronauts very hot!

Body image—the way people feel about their looks—is a big problem for many young people today. According to a ________, more than half the teenage girls in the USA think they should be on a diet (节食), and almost one in five teenage boys are ________ about their bodies and their weight.

But what’s the cause? In the study, many speak badly of the media. Turn on the TV and you’ll ________ see beautiful models, handsome actors and fit sports stars. Open a magazine or a newspaper, look through the Internet, and it’s usually ________.

Many young people feel pressure(压力) to ________ these “perfect” people. But for most, this is just not possible. In the USA, the common woman is 163 cm tall and weighs 64 kilos, ________ the common model is 180 cm tall and weighs 53 kilos.

When people don’t look the way many ________ people look, they may become less confident. Some stop eating properly in order to lose weight. Students can lose so much confidence that they start to ________ taking part in classroom activities at school.

Is there a solution to the problem? A 2021 study in the UK suggested that body image lessons should be provided in ________. Others believe it’s a problem that all of society needs to deal with. As an English saying goes, “Don’t judge a book by its ________.” Or as Meaghan Ramsey says, “We need to form an opinion about people by what they do, not what they look like.”

The third class of “Tiangong Class” was held at 3:45 p.m. on October 12, 2022. The China Manned Space Agency (中国载人航天局) announced the news on Tuesday ________. It was an educational class held by taikonauts (中国宇航员) at China’s space station. The Shenzhou-14 astronauts—Chen Dong, Liu Yang and Cai Xuzhe gave the class. It was lived worldwide by the China Media Group.

The astronauts ________ some interesting things inside the space station, for example, showing the change of the power in surface tension. The three space teachers also ________ students on the Earth during the class. They let the students learn the ________ of manned space flights. And they also encouraged young people to ________ an interest in science.

The past two “Tiangong Class” were taught by the Shenzhou-13 astronauts ________ space. Wednesday’s class was the third from the Chinese space station. Part of the teaching things was chosen from the suggestions given by ________ people.

Astronauts also invited ________ to carry out several experiments on the ground. After the students listened to the class, they knew the differences between the space and the Earth. ________ they could also discover the fun from such experiences.

The Shenzhou-14 members spent about six ________ at the space station. They did three space walks in all. They are very excellent.