63.What is the major challenge to astronauts when they sleep in space?

　　A. Deciding on a proper sleep position

　　B. Choosing a comfortable sleeping bag

　　C. Seeking a way to fall asleep quickly

　　D. Finding a right time to go to sleep.

　　64.The astronauts will suffer from a carbon-dioxide headache when _____.

　　?A. the y circle around on their bikes

　　B. they use microcomputers without a stop

　　C. they exercise in one place for a long time

　　D. they watch a movie while pedaling

　　65.Some astronauts feel sick on the station during the first few days because _____.

　　A. their senses stop working

　　B. they have to stand up straight

　　C. they float out of their seats unexpectedly

　　D. whether they are able to go back to the station

　　66.One of the NASA’s major concerns about astronauts is _____.

　　A. how much exercise they do on the station

　　B. how they can remain healthy for long in space

　　C. whether they can recover after returning home

　　D. whether they are able to go back to the station

　　6.【2015·北京卷】A

　　The Boy Made It!

　　One Sunday, Nicholas, a teenager, went skiing at Sugarloaf Mountain in Maine. In the early afternoon, when he was planning to go home, a fierce snowstorm swept into the area. Unable to see far, he accidentally turned off the path. Before he knew it, Nicholas was lost, all alone! He didn’t have food, water, a phone, or other supplies. He was getting colder by the minute.

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