问题
单项选择题
催化剂的活性随运转时间变化的曲线可分为（）三个时期。
A、成熟期一稳定期一衰老期
B、稳定期一衰老期一成熟期
C、衰老期一成熟期一稳定期
D、稳定期一成熟期一衰老期
答案
参考答案：A
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催化剂的活性随运转时间变化的曲线可分为（）三个时期。
A、成熟期一稳定期一衰老期
B、稳定期一衰老期一成熟期
C、衰老期一成熟期一稳定期
D、稳定期一成熟期一衰老期
参考答案：A
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| One day in September we were doing repair work on my parents' old house to get it ready for my youngest daughter's wedding. We had to 1 a great climbing plant that had grown across a roof beam (房梁), so that we could repair the roof and 2 the walls. When my husband was taking the plant away, he found a 3 of a blackbird. He then 4 something 5 among that mass of earth and straw of the nest. He broke the earth 6 it into pieces with his finger tips and, to his 7 , saw glittering gold. It was a child's bracelet (手镯). He ran into the house to 8 me. "You won't believe that the 9 blackbirds not only steal the best fruit we plant to feed on," he said,"but they also want their children to 10 in a cradle (摇篮) of gold!" When my daughter 11 on the eve of the 12 ,we told her about this 13 occurrence (事件). "Don't you remember, Mother?" she said with a loud 14 ."When I was eight, you gave me a bracelet that I 15 a few days later while out playing in the yard? It was this one!" As the bracelet no longer 16 its owner and was dirty, I decided to take it into my safekeeping. In December of the following year, the young couple's baby son was baptized (受洗礼). Among the 17 the newborn baby received, I placed his mother's bracelet, now shining like 18 . I hope that if my grandson 19 loses it, one of the 20 that live in my backyard is somewhere nearby. | ||||
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