[单选题]繁忙干线（），施工天窗时间及慢行处所按国铁集团相关规定执行。在不影响运输的前提下，维修天窗可与施工天窗等时长安排。
A.日常维修
B.临时维修
C.临时天窗
D.集中修期间

Chicago began life in 1779 (1) a small trading post on the Chicago River. A farsighted black freedman, Jean du Sable, did a flourishing fur (2) with the Native Americans. When his trading post became a fort and then a city, it was (3) Chicago. This is the Native American word for the wild onions found in the area.
In 1820 Chicago (4) ten or twelve houses and a store or two. Now it is the third largest city in the (5) , and still it continues to grow. Thousands of new buildings are (6) every year. They are built to accommodate new businesses and residences. More than seven (7) people now live in and around the city.
Astride the crossroads of the nation, Chicago is the largest railroad (8) in the world. No other city in the land is a larger trucking center. The city, (9) on lake Michigan, is the largest inland port in the world. O’Hare Airport is the world’s busiest commercia
A. business
B. company
C. store
D. area

Reading is a way of enjoyment, relaxation, rest or freedom from worry. These can be felt by the readers from the actual reading (36) and from the impact provided.
Reading provides the knowledge we are unable to gain from personal (37) . If we cannot travel around the (38) , we can read books (39) travel and gain information of (40) countries, people (41) their ways of life. We can also read about the (42) customs of different countries. Surely we cannot go (43) to the past, yet, by reading (44) , we can obtain knowledge of the past, something about the lives of great and famous (45) , and (46) the world it- serf.
From reading, we can (47) of new things, new methods of inventions, different methods of (48) things, different techniques of making things, etc. For example, we can learn (49) an electric cooker is invented. In cooking, we can learn how to (50) an app
A. habit
B. books
C. library
D. people