单项选择题

患者男性，41岁。胸腹部损伤后并发急性呼吸衰竭，行呼吸肌支持呼吸，若给予潮气量过大，频率太快，可引起

A.代谢性碱中毒
B.呼吸性酸中毒
C.呼吸性碱中毒
D.代谢性酸中毒
E.等渗性缺水
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单项选择题
关于高渗性缺水，下列不正确的是
A.中度缺水的缺水量为体重的4％～6％
B.血清钠为150mmol／L以上
C.患者通常无口渴
D.治疗给予5％葡萄糖溶液或低渗盐水
E.纠正缺水时，还需适当补钠
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SECTION B PASSAGESDirections: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.听力原文： During this century, archaeologists have discovered that trees can be a valuable tool for measuring timE.In scientific terms, this method is called dendrochronology. Dendrochronology is based on the scientific discovery that each year a tree grows a new layer of wooD.When you cut down a tree, for example, you can see and count the layers of concentric circles. These circles will reveal a great deal of information. The layers vary in color and in thickness. These variations are a result of differing climate conditions from year to year that affect the growth of the annual tings. Cold weather, for example, creates thinner and lighter tings while hot weather produces thicker and darker rings. All trees that grow in the same region will have roughly the same pattern of annual rings, and this can be used as a source of comparison and measurement.Early in this century, archaeologists began using the rings to date ruined structures and figures built in the southwestern United States. They did this by comparing the rings of the wood found in the ruins with the rings of recently cut trees. Slowly but surely, the system was extended backwards in time to measure older ruins. The heavy forestry of the United States, coupled with the relative youth of its history, led to a fairly uncomplicated study. Eventually, dendrochronology produced an accurate time and weather record for the American southwest that extended over 2000 years.What happens to trees each year?A.Their tings get thinner and thinner.B.They add a ring of wooD.C.Their rings get darker in color.D.They become more valuablE.
A.听力原文：
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