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问题 单项选择题 A2型题

某糖尿病患者伴有浸润性肺结核，应用甲苯磺丁脲，利福平，链霉素，用抗结核药两月后，尿糖加重并出现肝功能不良，其原因是（）

A.甲苯磺丁脲有肝毒性

B.患者又患了肝炎

C.利福平诱导肝药酶且有肝损害

D.链霉素的肾毒性

E.以上都不是

答案

参考答案：C

单项选择题

人民币国际货币符号为（）。

A、CMY

B、RMB

C、CNY
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单项选择题

You can tell the age of a tree by counting its ring. But these records of a tree’s life really say a lot more. Scientists are using tree ring to learn what’s been happening on the sun’s surface for the last ten thousand years. Each ring represents a year of growth. As the tree grows, it adds a layer to its trunk, taking up chemical elements from the air. By looking at elements in the rings from a certain years, scientists can tell what elements were in the air that year. Dr. Stevenson is analyzing one element, carbon-14, in ring from both living and dead tree. Some ring go back almost ten thousand year to the end of the Ice Age. When Stevenson followed the carbon-14 levels changed with the intensity of solar burning. You see, the sun has cycles. Sometimes it bums fiercely, and at other times it is relatively calm. During the sun’s violent periods, it throw off charged particles in fast moving streams called "solar winds". The particularly interfere with the formation of carbon-14 on earth. When there is more solar wind activity, less carbon-14 is produced. Ten thousand years of tree ring show that the carbon-14 level rises and falls about every 420 years. The scientists concluded that solar wind activity must follow the same cycle.

The purpose of the scientists in studying tree ring is to ().

A. examine the chemical elements in Ice Age

B. look into the pattern of solar wind activity

C. analyze the composition of different trees

D. find out the origin of carbon-14 on earth
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