关于我国的人口叙述错误的是（） A．我国是世界上人口最多_爱下问搜题

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问题选择题

关于我国的人口叙述错误的是（　　）

A．我国是世界上人口最多的国家

B．实行计划生育后，我国人口增长较慢

C．我国人口给资源、环境和社会经济产生巨大压力

D．基数大、增长快是我国人口的特点

答案

根据2010年全国第六次人口普查结果，中国总人口为13.7亿，约占世界人口总数的1/5，是世界上人口最多的国家．自20世纪70年代初期大力推行计划生育政策以来，中国人口过快增长的势头得到了有效遏制．由于中国人口基数大，青少年的比重较高，在今后一段较长的时期内，人口总量还将持续增长，在经历高峰期后，人口总数才会呈缓慢下降的趋势．但人口素质不高的状况在短期内还难以根本改变，人口问题依然十分突出．

故选：B．

阅读理解

A man lost his legs in a tragic accident. After the accident, only two fingers 36 on his right hand.
However, he was bright, creative and educated. He had gained much experience while traveling throughout the world. Yet, he became very 37 after the accident. He was afraid he would spend his life 38 and would no longer be able to live a life in a(n) 39 way.
One day, he remembered how he had 40 loved getting letters. He realized that he still had partial 41   of his right hand and could write with difficulty. Then, he had an idea. “Why not write to other people who need 42 ?”
Who to write to? He thought of people in prison. Many of them hoped to 43 their freedom. Others would keep feeling sad and remain locked away for the rest of their lives. He decided that he must try to 44   them.
He wrote to a prison officer about sending letters to prisoners. The prison officer replied that writing to the prisoners would be 45 . However, it would be 46  prison rules for them to write back.
Filled with the 47 of carrying out his idea, the man knew he had to write. He began sending one-way 48 of love, hope, strength and encouragement.
He 49 twice a week, testing his strength and ability to the limit. He poured his heart and soul into his words, 50 his experience and optimism.
It was difficult to write those letters, especially without hope of a 51 . Frequently, he felt discouraged. He often wondered if anyone 52 read his letters. However, he determined to 53 as long as he could help others.
One day he received a letter from the prison officer. It was a short note from the officer who monitored and 54 the prison mails.
The letter said, “Please write on the best paper you can 55 . Your letters are passed from cell (牢房) to cell until they fall to pieces!”

D．encouragement

A．immediately

单项选择题

用汽车尾气分析仪测量发动机处于快怠速状态下尾气中的CO和HC含量。若发动机技术状况良好，则CO排放量应该在1.0%以下，HC的排放量应该在0.0001以下，若两者的排放量均超标，且临时取下空气泵的出气软管，CO和HC的读数升高，而重新接上空气泵的出气软管后读数又下降，则说明（）。

A．三效催化转化器已经失效

B．燃油喷射系统或点火系统有故障

C．三效催化转化器已经堵塞