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问题 选择题

毛细血管的下列结构特点中，哪一项不与它的功能相适应（　　）

A．管壁薄，由一层上皮细胞构成

B．通常位于最小动脉和最小静脉之间．

C．管腔极小，仅能让红细胞单行通过

D．管内血流速度极慢

答案

毛细血管是连接最小的动脉和最小的静脉之间的血管，其特点是：数量多，分布广，管壁薄，只有一层上皮细胞组成，管腔小，只允许红细胞呈单行通过，血流速度慢，这些特点有利于进行物质交换．通常位于最小动脉和最小静脉之间与物质交换无关．

故选：B

单项选择题

Proper arrangement of classroom space is important to encouraging interaction. Most of us have noticed how important physical setting is to efficiency and comfort in our work. College classroom space should be designed to encourage the activity of critical thinking. We may be approaching the twenty-first century, but step into almost any college classroom and you step back in time at least a hundred years. Desks are normally in straight rows, so students can clearly see the teacher but not all their classmates. The assumption behind such an arrangement is obvious. Everything of importance comes from the teacher.
With a little imagination and effort, unless desks are fixed to the floor, the teacher can correct this situation and create space that encourages interchange among students. In small or standard-size classes, chairs, desks, and tables can be arranged in a variety of ways. The primary goal should be for everyone to be able to see everyone else. Larger classes, particularly those held in lecture halls, unfortunately, allow much less flexibility.
Arrangement of the classroom should also make it easy to divide students into small groups for discussion or problem-solving exercises. Small classes with movable desks and tables present no problem. Even in large lecture halls, it is possible for students to turn around and form groups of four to six. Breaking a class into small groups provides more opportunities for students to interact with each other, think out loud, and see how other students’ thinking processes operate all essential elements in developing new modes of critical thinking. In courses that regularly use a small group format, students might be asked to stay in the same small groups throughout the course. A colleague of mine, John, allows students to move around during the first two weeks, until they find a group they are comfortable with. John then asks them to stay in the same seat, with the same group, from that time on. This not only creates a comfortable setting for interaction but helps him learn students’ names and faces.

The author mentioned John in Paragraph 4 in order to ______.

A. describe a good seat-arrange mode in courses with small group format
B. give an example that students stay in the same seat throughout the course
C. create a comfortable setting for interaction
D. learn students’ names and faces
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单项选择题

支气管镜检查前用于预防咳嗽宜选用

A．喷托维林

B．可待因

C．右美沙芬

D．苯丙哌林

E．氯哌斯汀
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