1．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.

　　2．The astronauts will suffer from a carbon－dioxide headache when ________．

　　A．they 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

　　3．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．their brains receive contradictory messages

　　4．One of 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

　　Passage 4

　　(2015·安徽高考)As Internet users become more dependent on the Internet to store information, are people remembering less? If you know your computer will save information, why store it in your own personal memory, your brain? Experts are wondering if the Internet is changing what we remember and how.

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