问题
单项选择题 A1型题
下列由叶支气管至小支气管的结构变化，错误的是（）。
A.管径变小
B.管壁变薄
C.杯状细胞、腺体和软骨减少或消失
D.上皮由假复层纤毛柱状变成单层纤毛柱状
E.平滑肌纤维增多
答案
参考答案：D
解析：小支气管上皮仍为假复层纤毛柱状上皮。
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下列由叶支气管至小支气管的结构变化，错误的是（）。
A.管径变小
B.管壁变薄
C.杯状细胞、腺体和软骨减少或消失
D.上皮由假复层纤毛柱状变成单层纤毛柱状
E.平滑肌纤维增多
参考答案：D
解析：小支气管上皮仍为假复层纤毛柱状上皮。
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| Fire can help people in many ways. But it can also be very harmful (有害的). Fire can keep your house 1 , give light and cook food. But fire can burn things, 2 . Big fire can burn trees, houses, animals or people. Nobody knows how people began to use fire. But there are 3 interesting old stories about how a man or woman started a fire. One is 4 a man. The man 5 a very long time ago. He went up to the sun and 6 fire down. Today people know how to make a fire with matches. Children sometimes 7 to play with them. But matches can be very dangerous. One match can burn a piece of paper, and 8 it could burn a house. A small fire can turn a big fire very quickly. So you 9 be careful with matches. Be careful with fire, and it will 10 you. But if you aren't careful with fire, and it may hurt you. | ||||
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