读我国华北地区等高线地形图（单位：米）和西北局部地区年降水量_爱下问搜题

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问题问答题案例分析题

读我国华北地区等高线地形图（单位：米）和西北局部地区年降水量（单位：毫米）图，其中A河河谷被称为我国的“西域湿岛”。完成下列问题。

左图中乙地区是我国环境问题严重的地区之一，说出其环境问题，并分析产生的主要自然原因。

答案

参考答案：

水土流失；原因：降水多而集中，多暴雨；黄土疏松，容易被冲刷、侵蚀；植被覆盖率低。

解析：读图，乙地区位于黄土高原，夏季降水多而集中，且多暴雨。黄土疏松，容易被冲刷、侵蚀。黄土高原地区的植被覆盖率低。所以该地主要生态环境问题是水土流失。

完形填空

Mark was walking home from school one day when he saw a boy in front of him. He had dropped all of the books he was   16 , along with two sweaters, a basketball and a walkman (随身听).
Mark stopped and helped the boy pick the things up.   17  they were going the same way, he helped to carry some of his things. As they walked, Mark   18  that the boy’s name was Bill. He loved computer games, basketball, music and history,   19  he was having trouble with some of his   20  in school.
They arrived at Bill’s home first and Mark was   21  in for a Coke and to watch some television. The afternoon passed   22  with a few laughs and some small talk, then Mark went home.
They continued to   23  each other at school, had lunch together once or twice a week, and then they   24  finished middle school. Three weeks before they left school, Bill asked Mark if they could talk.
Bill reminded Mark of the day years ago when they had first   25 . “Did you ever wonder   26  I was carrying so many things home that day?” asked Bill.
“You see, I cleaned out my locker (锁柜) because I didn’t want to leave   27  for anyone else. I was going home to kill myself. But after we   28  some time together talking and laughing, I   29  that if I killed myself, I would have missed many good times. So you see, Mark, when you   30  those books that day, you actually saved my life.”

单项选择题

判断病人临床死亡期的主要指标是 ()。

A．肌张力松弛

B．心跳呼吸停止

C．桡动脉搏动未触及

D．瞳孔对光反射迟钝

E．机体新陈代谢障碍