男性40岁。患类风湿关节炎合并肺间质纤维化，应用激素维持治疗。近1周来咳嗽，痰稍带脓性，低热。2d前起气急逐渐加重，前来就诊。体检：明显气急、紫绀，两下肺广泛湿啰音。心率110次／分，律齐。动脉血气分析（呼吸空气）示pn7．48，PaCO4kPa（30mmHg），PaO6kPa（45mmHg）。
机械通气治疗呼吸衰竭，为避免过度通气，应采取下列哪项措施（）
A.动脉血气分析监测，适当调节参数，或加用死腔
B.可允许一定的过度通气
C.加用酸性药物，防止碱血症
D.使用镇静剂，抑制呼吸中枢
E.以上都不是
参考答案：A
阅读短文，根据短文内容，从短文后的五个选项中选出能填入空白处的最佳选项。选项中有一项为多余选项。（共8分，每小题2分） April 22 is Earth Day. Everyone on earth should care about and protect the earth! The earth has warmed by about 1 °F over the past 100 years, but why and how? Well, scientists are not quite sure. Maybe the earth gets warmer and warmer on its own. __1__ First, greenhouse effect (效应) is a very important reason for the change of the earth. People give out too much energy into the air every year. It makes the earth warmer. __2__Sometimes it becomes too hot and sometimes too cold. Sometimes there is too much rain and sometimes too little. The change of the climate makes the earth warmer. In turn, the warmth of the earth changes the climate, too. When the earth becomes warmer, there may be more rain and a rise in sea level. __3___ On a Pacific island, 100 people have to move to higher ground because the sea is rising. These people can no longer live on the coast. Before that, two islands without people went underwater in 1999. Scientists say that the seas can rise by nearly one metre by 2100. People can affect the earth's air, land and water. As for us, we can do many things to protect the earth. __4___ We can tell more people about protecting the earth.
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