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问题 单项选择题

发动的燃油泵是两级泵组成，其中低压级和高压级各是什么类型的泵（）

A.低压级是离心泵，高压级也是离心泵

B.低压级是离心泵，高压级是齿轮泵

C.低压级是齿轮泵，高压级也是齿轮泵

D.低压级是齿轮泵，高压级是离心泵

答案

参考答案：B

阅读理解

When I was a ten-year-old girl, I was once asked to deliver a speech titled “A Real Test in My Life”. To talk before the whole class! Just imagine how   31  (terrible) shy I was the moment I thought of that with so many eyes fixed upon me. I had no other   32  (choose), though. First I was to draft the speech and that was just a piece of cake for me, because I was a good writer－something to pride myself in. But the hard part   33  (lie) in my oral presentation; to read from   34  paper was not allowed; I had to give the speech   35  my memory and in front of such a big audience! A real trial began when I stood on the platform with my legs   36  (tremble) and my mind blank. How much time had passed by, I didn’t know. My listeners were still waiting, patiently and without any signs of rushing me. Gradually I found­­  37  back, giving out my speech with difficulty. Finally I finished. After   38  seemed to be a hundred years, I found my audience applauding. I made it! From then on, my fear of talking before an audience disappeared. Actually with my confidence building   39 , I now turn out to be a great speaker. Looking back, I know the greatest difficultyon our way to success is our fear; overcome it,   40  we will be able to achieve our goals.
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单项选择题 A3/A4型题

男性，30岁。因受凉后出现畏寒、发热，咯铁锈色痰，伴左侧胸痛。胸片左下肺大片密度高阴影。

该病原体耐药的主要机制为（）

A.PBP结构改变

B.产生生物被膜

C.膜通透性降低

D.主动外排系统

E.产AmpC酶
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