问题
单项选择题
离子交换树脂应贮藏于室内，并保持周围环境温度在5～40℃，是为了（）。
A、防冻
B、防霉
C、防干
D、都不对
答案
参考答案：A
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离子交换树脂应贮藏于室内，并保持周围环境温度在5～40℃，是为了（）。
A、防冻
B、防霉
C、防干
D、都不对
参考答案：A
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| I found a new job in a school last year. When I entered the school, I was really 1. ______. Before I arrived, I thought the school would be 2. ______ and all the students would be having class in the classroom. 3. ______ all that I saw were the students 4. ______ on the playground. Some were playing with the sand and some were 5. ______ wooden toys. "What are you doing?" I asked a ten-year-old boy. "We are playing," he replied without 6. ______. I was confused. How could all the students be playing outside 7. ______ studying in the classroom? And none of them 8. ______ to care about their studies. Aren't they worried about their studies at all? What about the teachers? Do they 9. ______ them to play? With the 10. ______ in my mind, I went to the head teacher's 11. ______. "The students are allowed to play for ten days. In these ten days, they don't have to study in the classroom. What they need to do is to do what they like," said the head teacher. "But 12. ______?" I asked. "There was once a very good student in our school. He was very good at his 13. ______. But he never played. He studied all the time. However, he 14. ______became ill and was sent to the 15. ______ and died only four days later. Before he died, we 16. ______him what he wanted to do 17. ______. He said he wanted to play. So we 18. ______ to let the students play for ten days every 19. ______," said the teacher, and I finally knew why. That student's death gave the other students the 20. ______ to play. | ||||
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