问题 阅读理解

阅读理解。

     Every morning, the newspaper chief editor (主编) holds a meeting with the reporters. They discuss the

main events(事件) of the day. Reporters are then sent to cover the events.

     As soon as the reporters know what to write about, they get down to work. They telephone people and

fix a time for a face-to-face interview with them. Sometimes they do telephone interviews. Checking

information is very important. They go to the newspaper's own library to look up any information that they

need. This is called "doing one's homework".

     At the same time, the picture editor decides which photographs will be used for the next day's paper.

All the people who work on a newspaper must be able to work fast. Reporters have to stop working on one

story and start working at once on the important new one. They must find out the new information as quickly

as possible. Later in the day, everything is put together at the news desk. Reporters return, type their stories

into the computer and hand them to the editor.

     The chief editor decides which will be the most important story on the front page. Sometimes this will

have to be changed if something more important happens late in the day. Other editors read the stories which

the reporters have written and make any necessary changes.

      Finally, there is no more time left for adding new stories, and the time for printing (印刷) the newspaper

has come. This is done on fast-moving printing machines. The newspapers are then delivered (发送) by

truck, plane or rail. Speed is important. People want to buy the latest newspaper, nobody wants to buy

yesterday's.

1. What is the work in a newspaper office like? [ ]

A. Interesting and confusing.

B. Important and patient.

C. Particular and necessary.

D. Fast and busy.

2. According to the passage, the right order for a reporter's work is _____.

   a. writing stories b. doing interviews c. joining in a discussion

   d. doing homework e. handing stories to the editor [ ]

A. cbade

B. cdeab

C. cbdae

D. cadbe

3. The front page contents (内容) are decided by _____. [ ]

A. the importance of the events

B. how well the stories are written

C. the knowledge of the chief editor

D. whether they are the latest 

4. Word editors' work is to _____. [ ]

A. help the chief editor with the morning discussion

B. decide when and how the papers can be printed

C. read the stories and make necessary changes

D. get together information from reporters and photographers

5. The best title for this passage is "_____". [ ]

A. How a newspaper is produced

B. How newspapers are delivered

C. What kind of papers readers like

D. Whose work is more important

答案

1-5 DCACA

问答题

如图中的.“翔凤”(ARJ21)是我国第一次完全自主设计并制造的支线飞机.于2008年11月28日试飞首飞1h获得了成功,并计划在2009年开始逐步投入规模化生产.

(1)翔凤(ARJ21)支线客机使用的是喷气式发动机,其原理是:将吸入的空气与燃油混合,点火爆炸后膨胀产生高速空气向后喷出,发动机将空气向后喷出时推动飞机向前运动.这是因为______.

(2)飞机的升力是由于机翼上、下表面出现了压力差,垂直于相对气流方向的压力差的总和就是机翼的升力.这样飞机借助机翼上获得的升力克服地球引力,从而翱翔在蓝天上了.飞机机翼导流板横截面的形状是下列四图中的______.

(3)物体在流体(液体和气体)中运动时,受到阻碍物体运动的力,称作为“流体阻力”.飞机机身设计成“流线形”是为了减小______.影响“流体阻力”大小的因素有物体的形状和大小、物体表面的粗糙程度、物体和液体间相对运动的速度以及物体垂直于运动方向的横截面大小.某同学为了验证“流体阻力的大小与运动物体表面粗糙程度有关”,设计了如下实验方案:

①用弹簧测力计拉一艘表面光滑的船模型在水中运动,并记下弹簧测力计的示数F1

②用弹簧测力计拉另一艘表面粗糙的船模型在水中运动,并记下弹簧测力计的示数F2

③通过比较F1与 F2的大小,就能得出物体受到流体阻力是否与物体表面粗糙程度有关.

请你对该同学的实验方案进行评估,指出其中存在的问题(仅要求写两点):

A.______;B.______.

(4)飞机在跑道上缓慢滑行时,通过跑道上的压力感应装置测得飞机前轮压强为2.0×105Pa,后轮压强为2.5×105Pa,已知前轮触地总面积0.25m2,后轮触地总面积1.2m2.求此滑行飞机的质量.

(5)“翔凤”首次试飞1h消耗燃油1.5T,行程600km,已知航空燃油的热值为8.0×107J/kg,发动机效率为20%,求飞机在试飞时获得的平均水平推力.

选择题