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问题 选择题

分类是重要的科学研究方法，下列物质归类不正确的是 [ ]

A. 电解质：明矾、氯气、冰醋酸、硫酸钡

B. 化合物：干冰、烧碱、冰水混合物、胆矾

C. 混合物：铝热剂、矿泉水、水玻璃、漂白粉

D. 同素异形体：C60、C70、金刚石

答案

答案：A

阅读理解

阅读短文，判断正(T)误(F)。

     Last Saturday,l visited my uncle. They live in a village. Behind their house, there were six orange trees. 

In front of the house, there were four peach trees. A lot of peaches are on the trees. I picked some and

tasted them Under the peach trees, there were lots of flowers. My aunt gave me a basket of pears. She

has two pear trees. I like to eat pears and bring back some nice pears.

( ) l. My uncle and aunt live in a city.

( ) 2. There were fruit trees there.

( ) 3. The pear trees were in front of the house.

( ) 4. There were lots of flowers under the peach trees.

( ) 5. I don't like to eat pears.
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单项选择题 B型题

静脉导管（）

A.重要的医源性感染途径

B.长期使用广谱抗生素易导致

C.组织细菌含量<105CFU/g组织

D.病原菌侵入到邻近的活组织当中，伴有全身症状

E.血培养阳性
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