问题 单项选择题 B1型题

在黏膜表面黏附时可产生分解SIgA的蛋白酶的是()

A.葡萄球菌

B.链球菌

C.肺炎链球菌

D.脑膜炎球菌

E.淋球菌

答案

参考答案:E

解析:选析第2题。该试题为基本知识类题目,考查淋球菌致病性,正确答案为E。淋球菌通过其菌毛可黏附在人类泌尿生殖道黏膜表面,并产生大量IgA1蛋白酶,可以分解存在黏膜表面的特异性分泌型IgA(SIgA),从而使淋球菌在黏膜表面大量增殖,并侵入黏膜下层,引起淋病。其他病原性球菌均不能产生分解SIgA蛋白酶,故不能引起性传播疾病。

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Many people think of guys as being carefree when it comes to their appearance. But in fact, a lot of guys spend plenty of time in front of the mirror.    1   .

Body image is a person’s opinions and feelings about his or her own body and physical appearance.     2   . You appreciate your body for its capabilities and accept its imperfections.

So, what can you do to develop a positive body image? Here are some ideas:

Recognize your strengths. Different body types are good for different things. What does your body do well? Maybe your speed, strength, or coordination makes you better than others at a certain sport. That may be basketball, table tennis, mountain biking, dancing, or even running. Or perhaps you have non-sports skills, like drawing, painting, singing, playing a musical instrument, writing, or acting.      3   .

Exercise regularly. Exercise can help you look good and feel good about yourself. Good physiques (体形) don’t just happen.     4   . A healthy habit can be as simple as exercising 20 minutes to one hour three days a week. Working out can also lift your spirits.

Respect your body! Practicing good habits --- regular showering; taking care of your teeth, hair, and skin; wearing clean clothes, and so on --- can help you build a positive body image.

   5     . Your body is just one part of who you are. Your talent for comedy, a quick wit (智慧), and all the other things make you unique. So try not to let small imperfections take over.

A.Use this as an opportunity to discover what you’re good at.

B.Be yourself.

C.They care just as much as girls do about their body image.

D.Just explore talents that you feel good about.E. They take hard work, regular workouts, and a healthy diet.

F. The good news is that self-image and body image can be changed.

G. Having a positive body image means feeling satisfied with the way you look.