根据第二段第一句“Thereisalmostnogravityinspace, soastronautsdonothavetosleeponthebedorthefloor.(太空中几乎没有重力,所以宇航员不必睡在床上或地板上。)”可知,宇航员在太空做很多事情很困难的原因是太空中几乎没有重力,故选D。57.【答案】B【解析】题干的意思是:宇航员为什么在太空中使用勺子?A.把果汁倒...
Are you interested in the life of astronauts in space? Do you know how they eat, sleep and bathe in space? Next we will tell you some useful information.How do the astronauts eat in space?Like people on the Earth, the astronauts also have three meals every day. Their food is stored ...
How old is planet Earth? People have been trying to figure that out since, well, since the beginning of time. Roberto Machado Noa / Getty Images If you look up the age of Earth on science websites and in publications, you'll generally find an estimate of 4.54 billion years, plus or...
Nij: And then a really huge molten rocksmashed into Earth. Nij: And then a little chunk of that moltenrock flew out into space to make the moon. Bri: Our moon used to be part of the earth? Nij: Yes. So the earth was just out there,floating in space around the sun. ...
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Whether in a shuttle (航天飞机) or on the space station, one of the 1. ___ (big) challenges astronauts have is being weightless. To stop themselves from floating around, astronauts have two 2. ___ (choose). They can sleep in sleeping bags 3. ___ (tie) to a seat or the wall. ...
People would have to wear special boots to prevent themselves from floating_ into space 6. 食物最有可能是药丸的形式,而且并不是那么可口。 Food would most probably be in the form of pills ___ and would not be so tasty 7. 火星上的重力只有地球重力的八分之三。 The gravity on Mars i...
"How to `Catch' Floating Populations? Research and the Fixing of Migration in Space and Time." Ethnic and Racial Studies 35 (10): 1775-1793.Meeus, B. 2010, How to 'catch' floating populations? Fixing space and time while researching migration. Bielefeld: COMCAD....
Thematic maps can also show extremely specialized information, such as the availability of internet access in different parts of the world. This combination of locations and attributes makes it possible to put lots of information into a very small space. A single map can show you all of the ...
It helps to hold the intestines in place, preventing them from shifting or becoming twisted. By providing stability to abdominal organs, it ensures that the diaphragm, which is crucial for breathing, has adequate space and freedom to move. A well-positioned diaphragm can efficiently expand and ...