问题 单项选择题 A1/A2型题

导致血源性肺脓肿最常见的病原菌是()

A.表皮葡萄球菌

B.铜绿假单胞菌

C.金黄色葡萄球菌

D.肺炎克雷伯杆菌

E.链球菌

答案

参考答案:C

解析:血源性肺脓肿的常见感染来源为皮肤、骨髓的化脓性感染,而这些部位的感染中金黄色葡萄球菌的比例较高,血源性肺脓肿以金黄色葡萄球菌多见。

阅读理解

阅读下面短文,根据短文内容完成下列句子。

                                        Different school year in US and Cluna

    With the beginning of the new semester, we have to say goodbye to the summer holiday.  But do you

 know students in America start their semester earlier than we do?

    Most American schools have a total of about 180 days of teaching.  The fall semester goes from early

 September to mid-December, and the spring semester goes from early January to mid-June.

     In China, we have two semesters and each has about 20 weeks.  The US school year is about 20 days

  shorter than it is in China.

    In the US, school kids have a long summer vacation and a few breaks,  which are like China's Golden

 weeks. One is around Christmas, lasting about two weeks. Another is in February, for only one week. It

 can also be called "ski week", because some students go skiing during the break. And there is a

 one-week-long spring break.  It is in March or April, around Faster.

     Throughout the vear, there are also a few other holidays when students don't go to school, such as

 Thanksgiving Day.  This is similar to Mid-Autumn Festival in China.

     Now we can understand why American students start, school earlier than us at this time of year.

1. Spring semester in America is from _____ to _____.

2. Fall semester in American school year is from _____ to _____.

3. There are there breaks, there, One is _____ .another is one-week-long spririg break, either in _____.

4. There are a few holidays when students don't go to school, such as _____.

5. Thanksgiying Day in the USA is similar to _____ in China.

判断题