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【简答题】

Space station commanders must ( ) themselves to the welfare of their crews. As a result, safety has to be their number one concern.

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【简答题】The International Space Station is usually ( ) by a crewof six people.

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【简答题】When people are working together in a small space like the International Space Station, it is important to have someone acting as a ( ) who can help the crew avoid arguments.

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【简答题】Having an astronaut as part of the family can be very complicated, but NASA provides support to help families ( ) the situation.

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【简答题】Although life on the International Space Station seems adventurous, there are still many ( ) tasks that have to be performed, such as cooking and cleaning.

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【简答题】The International Space Station is located in low-Earth ( ) , and it circles the planet about 16 times per day.

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【单选题】The task was daunting, so we were able to finish quickly.

A.

correct

B.

incorrect

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【简答题】People who want to become astronauts have to study ( ) in order to the necessary science, math, and languages.

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【简答题】The training facility was ( ) by a huge pool that took up all the space in the building.

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【单选题】The two sides couldn't agree, so they worked with a mediator.

A.

correct

B.

incorrect

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【单选题】Jack has been quarantined. He was exposed to a very dangerous virus.

A.

correct

B.

incorrect

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