问题
单项选择题
血凝和血凝抑制试验是基于下列哪一种原理建立起来的？（）
A.特异性受体结合病毒
B.细胞膜的选择性
C.病毒的黏附力
D.病毒融合细胞
E.病毒的红细胞凝集现象
答案
参考答案：E
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血凝和血凝抑制试验是基于下列哪一种原理建立起来的？（）
A.特异性受体结合病毒
B.细胞膜的选择性
C.病毒的黏附力
D.病毒融合细胞
E.病毒的红细胞凝集现象
参考答案：E
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| Surfing: It’s Not Just for Boys Any More If you asked high school girls to name their favorite sports, most would probably say basketball or volleyball. I happen to be one of the few girls who would 1 : surfing(冲浪运动) . But isn't that a boy thing? Some people 2 Most certainly not. I started surfing about five years ago and 3 in love with the sport on the very first day. Riding that first 4 was the best feeling I had ever experienced. When I try to 5 surfing with other things, I find it very difficult because, in my 6 , there's nothing like it. It involves (牵涉) body, 7 , and soul. There's sand between my toes and cool, salt water all 8 the US. The feeling I get when I'm surfing across that 9 , becoming one with the 10 is like I'm weightless. The one thing I can 11 from surfing and not any other sport is endless challenge (挑战). You can never be the "best surfer" because the ocean 12 an uncountable variety of waves that nobody can ever master. The variations of surfing styles are wonderful. Some surfers are free and flowing; others are very aggressive(活跃有力的) and 13 . All of these things attract me to surfing and make it 14 from any other sport. I've 15 to tell every girl I know to do something that people don't think girls can do. It's part of being human to advance to new 16 . So shouldn't it be expected that girls should step up and start 17 the limits of things boys and men used to dominate(主宰) ? There're women 18 side by side with the President of our country, so why not stand side by side with the boys 19 the football team or out in the water surfing? Give girls a chance to 20 , and they will. | ||||
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