C．a future robot will explore the moon easily by using a four-wheeled rover

　　D．a future robot is stronger and will handle any difficulty in space easily

　　54．It can be learned from the passage that

　　A．the future R2 will perform experiments without human control

　　B．humans are much smarter with their hands than robots in space

　　C．someday humans might control an avatar on the moon

　　D．sending a human to the moon will cost far less than sending a robot

　　D

　　The end of my sophomore year was approaching．Mom called me at the dorm one evening during the last week of May．My summer break would be spent with grandma and grandpa, helping out around their farm．The arrangement made good sense to all the family．I wasn’t fully convinced of that myself but guessed it was just one summer．Next year would be my little brother’s turn．

　　I arrived late that afternoon．Grandma had fixed more food than the three of us could possibly eat．She loved me entirely too much．The next morning, Grandpa fixed breakfast for the two of us． He told me Grandma had tired herself out yesterday and was going to rest in bed a little longer．I made a mental note to myself to not ask her to do things for me while I was there．I was there to help, not be a burden．

　　Weeks passed．I gradually settled into a routine of daily work with Grandpa．In the evenings I usually read or talked with Grandma．She never grew tired of hearing about college or anything I was involved in．She told me stories about her childhood, family and the early years after she and Grandpa had married．

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