关于急性失血引起的变化，下列哪项是错误的( )
A．动脉血压下降
B．血细胞比容升高
C．心率加快
D．中心静脉压下降
E．皮肤苍白、湿冷
参考答案：B
解析： 急性大量失血时，颈动脉窦-主动脉弓压力感受器受到的刺激减弱，导致心脏活动反射性加强，外周血管收缩，使血压回升。由于外周小动脉收缩明显，毛细血管血压降低，组织液回流增加，血液稀释，血细胞比容降低。
| 任务型阅读。阅读短文，并按要求完成1-5题。 1题为判断正误（“T”表示正确，“F”表示错误）； 2-4题为简略回答问题；5题为英译汉。 | ||
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| Finish the tasks according to the passage. 1. Sandy is fifteen years old and she wishes to be her own boss. ___________________________________________________________________ 2. What does Sandy think her parents and her teachers are always doing about her? ___________________________________________________________________ 3. Why is Sandy's mother worried when Sandy wants to help Mrs. White? ___________________________________________________________________ 4. Should Sandy look after Mrs. White's pet dog? ___________________________________________________________________ 5. Put the underlined sentence in the passage into Chinese. ___________________________________________________________________ |