问题
单项选择题
下列以纳米(nm)作为测量其大小的微生物是
A．细菌
B．立克次体
C．支原体
D．衣原体
E．病毒
答案
参考答案：E
解析： 在病毒、细菌、真菌以及支原体、衣原体、立克次体中，病毒的大小在纳米级，真菌最大，细菌的大小在0.5～3.0μm，后三者都在0.2～0.5μm之间。
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下列以纳米(nm)作为测量其大小的微生物是
A．细菌
B．立克次体
C．支原体
D．衣原体
E．病毒
参考答案：E
解析： 在病毒、细菌、真菌以及支原体、衣原体、立克次体中，病毒的大小在纳米级，真菌最大，细菌的大小在0.5～3.0μm，后三者都在0.2～0.5μm之间。
An old man lived in a nice house with a large garden. He took care of his 1 all the time, watering and fertilizing(施肥)them. One day a young man went by the garden. He looked at the beautiful flowers, imagining how happy he could be 2 he lived in such a beautiful place. Then, suddenly he found the old gardener was 3 . He was very surprised about this and asked, “You can’t see these flowers. 4 are you busy taking care of them every day?” The old man smiled and said “I can tell you four reasons. First, I was a gardener when I was young, and I really like this job. Second, 5 I can’t see these flowers, I can touch them. 6 , I can smell the sweetness of them. As to the last one, that’s you.” “Me? But you don’t know me,” said the young man. “Yeah, it’s 7 that I don’t know you. But I know that flowers are angels(天使) that everybody 8 . We enjoy the happiness these flowers have brought us.” The blind man’s work opened our eyes and 9 our hearts, which also made his life 10 . It was just like Beethoven, who became deaf in his later life and wrote many great musical works. Beethoven himself couldn’t 11 his wonderful music, but his music has 12 millions of people to face their difficulties bravely. Isn’t it one kind of happiness?
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