问题
单项选择题 A1/A2型题
下列病毒直径最大的为（）。
A.痘病毒
B.流感病毒
C.巨细胞病毒
D.乙型肝炎病毒
E.人类免疫缺陷病毒
答案
参考答案：A
解析：痘病毒为病毒粒最大的一类DNA病毒，结构复杂。病毒颗粒呈砖形或椭圆形，大小（300～450）nm×（170～260）nm。
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下列病毒直径最大的为（）。
A.痘病毒
B.流感病毒
C.巨细胞病毒
D.乙型肝炎病毒
E.人类免疫缺陷病毒
参考答案：A
解析：痘病毒为病毒粒最大的一类DNA病毒，结构复杂。病毒颗粒呈砖形或椭圆形，大小（300～450）nm×（170～260）nm。
“But I feel good doing this!” the little boy’s voice rang in my ears when I entered the mall. He stood raising for cancer research. In the cold wind, he pulled his hat down over his ears. He warmed one hand in his pocket and held a list with the other hand. I noticed him greeting the people passing by gloves on his hands. I checked my purse but I didn’t find any change. I was ready to give money because I wished cancer could be cured (治愈) one day. “I’ll bring you some money when I returned” I the little boy. “Thank you!” he smiled and he seemed almost in the cold air. I suggested he come inside the mall, but he said, “The guard there said is allowed to raise money for charities (慈善) in the mall. But I feel good doing this here. It’s OK.” I did my shopping and about buying something for him. Finally, I bought a pair of gloves, brown ones. The cashier (收银员) felt curious when I the boy’s words “But I feel good doing this!” The boy still stood where he had been. I offered some money to him and in the list that he handed to me. Then he told me that his best friend George had leukemia (白血病). He did this in order to help him out of . With tears full of my eyes, I put the gloves that I bought for him into his hands. “Will the cancer research give you something to thank you for doing this?” “Oh yes!” the boy said and his eyes up with joy, “They sure do! Now I can stand here much than I expected!” “What do you receive then?” I asked. He answered with a smile, “I get another new, empty list.”
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