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A. I don’t think so. B. Oh, I’m sorry.
C. That’s too bad. D. I’m afraid not.
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单项选择题
Why are some scientists interested in studying aging problem
A. They want to increase the general ability of our bodies.
B. They may be able to find a better way of our life.
C. If they can pin down the biochemical process that makes us age, there will be hope for extending the length of life.
D. They want to find out if there is a link between how efficiently a cell could repair itself and how long a creature lives.
单项选择题
Finally, what happened to the song Good Morning to All after the addition of the second verse
A. It was even more popular than before.
B. It was no longer sung by the children in kindergarten.
C. The composers, Mildred and Patty, gave up their rights to own the song.
D. It was gradually replaced by the addition, having a new name "Happy Birthday to You".
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