关于病菌的致病因素，错误的是（）。 A.病菌有黏附因子 B.病菌_爱下问搜题

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问题单项选择题 A1/A2型题

关于病菌的致病因素，错误的是（）。

A.病菌有黏附因子

B.病菌有荚膜、微荚膜

C.与病菌的胞外酶有关

D.与病菌的内、外毒素有关

E.与病菌侵入的数量并无密切关系

答案

参考答案：E

解析：外界侵入的病菌或机体内条件致病菌在人体抗感染能力发生缺陷时，便会引起外科感染。病菌的致病因素主要有：①病菌有黏附因子、荚膜或微荚膜而侵入组织内生存繁殖。②病菌的胞外酶、外毒素、内毒素等分解组织，使感染扩散，造成全身性反应。③侵入人体组织内病菌的数量也是致病条件之一。

完形填空

It was Thanksgiving morning. In the crowded kitchen of my small home I was busy preparing the traditional Thanksgiving turkey when the doorbell rang. I opened the front door and saw two small children in rags huddling together inside the storm door on the top step.
"Any old papers, lady?" asked one of them.
I was busy. I wanted to say “no” __ __looked down at their feet. They were wearing thin scandals (凉鞋),wet with heavy snow.
“Come in and I'11         you a cup of hot cocoa.”
They walked over and sat down at the table. Their wet shoes left       on the floor．I     __  them cocoa and toast with jam        the cold outside. Then I went back to the kitchen and started again on my household budget. The silence in the front door __ __me. I looked in. The girl__   the empty cup in her hands, looking at it. The boy asked in a flat       ," Lady ．．． are you rich?"
"Am I rich? Mercy,         !" I looked at my shabby slipcover(家具套)．The girl put her cup back in its saucer（茶碟）      .
“Your cups match your saucers．”
Her voice was ___ __with a need that no amount of food could supply．They left after that, holding their       against the wind．They hadn't said thank you．
They didn’t         to. They had done more than that. Plain blue china cups and saucers were only worth five pence. But they __ __.
I tasted the potatoes and stirred(搅动)the meat soup. Potatoes and brown meat soup, a     __ over our heads, my man with a good steady job—these things matched, too．
I moved the chairs back from the fire and      the living room．The muddy prints of small scandals were still         on my floor. “      them be for a while,” I thought. Just        I should begin to forget how         I am.

多项选择题

目前我国出口市场仍主要集中在（）。

A、港澳地区

B、美国、日本

C、欧盟国家

D、独联体、东欧国家

E、东盟国家