职称英语(理工)
As the industry developing in these years,most of the rivers have been contaminated by sewage （污水）.A:polluted B:downgraded C:mixed D:blackened
题目
B:downgraded
C:mixed
D:blackened
相似问题和答案
第1题：
The new multipurpose gymnasium is reported to _______ within two years.
A. have completed
B. have been completed
C. having completed
D. having been completed
第2题：
5．I have _________him for ten years．
A． been knowing
B． been known
C． known
D． knowing
5．C【解析】know作“知道”，“懂得”讲时，不能用于进行时态（包括完成进行时）。
第3题：
听力原文：M: So, Jane, how long have you been an author?
W: Well, Tom, I didn't start writing until I was in my thirtieth, and I'm over seventy now. So goodness, I must have been writing for about forty years.
How long has the woman been an author?
A．About 30 years.
B．About 40 years.
C．About 60 years.
D．About 70 years.
解析：数字计算题。文中出现3个数字，30岁开始写作，现在70岁，所以共写了40年。
第4题：
A、have been working
B、have worked
C、had worked
D、had been working
第5题：
Mr.Smith ____ when the government for 37 years by the time retires.
A、will work
B、will have worked
C、will be working
D、will have been working
第6题：
Passage Five
From the beginning rivers have played an important part in the life of man. Man of the earliest times used the rivers as a means of traveling. Today rivers still serve as a great waterway for the transport and people.
In ancient times, man settled near rivers or on river banks and built up large empires.
Water is the Nature's most precious gift to man. Man needs water to irrigate his crops, to cook and to wash. In nations all over the world rivers mean life and wealth. They feed and clothe the nations around them.
Water is also a source of energy and power. Man constructs huge dams across the river to control the water for irrigation and get the energy needed to drive generators. The electrical power is then directed to homes, cities, factories and television stations.
Man uses water each day. His main source of water comes from reservoirs, which in turn get their water from the rivers.
Rivers also bring down soil and minerals from the mountains and deposit them on the plains building up rich river deltas for raising plants and crops. Fresh water life in rivers or in lakes fed by them provide man with food.
In a small way rivers help to keep man in good health and provide for his amusements. Various forms of water sports keep man strong and healthy.
Rivers have run on this earth long before man. Man's future ability to live is uncertain, but rivers will flow on forever.
52. Rivers have been important to man______.
A. since the last century
B. for a very long time
C. since a few hundred years ago
D. since a few years ago
52．答案为B 此题为细节题。从本文第十句可以知道河流从一开始就在人类生活中扮演着重要角色，所以河流对人类重要的时间应当选B(很久了)。
第7题：
John told us that by the end of the year they _____ together for thirty years.
A. would have been living
B. would have lived
C. would have been lived
D. will have been living
第8题：
39．— _________ have you been learning English? ．
—I have been learning English for six years．
A． How long
B． How often
C． How far
D． What time
39.A【解析】根据第二句的回答可知第一句问的是 “你学英语多久了”，故A为正确选项．
第9题：
A had been; have seen
B have been; have seen
C had been; had seen
D have been; had seen
第10题：
His parents _______ the US for ten years.
A、have been
B、have gone to
C、have been to
D、have been in