题目内容
Before a new type of airplane goes into service, every part of it is tested again and again. But there are two tests that are more important than all the others.
The first is called the " tank(贮水池) test". A modem airplane must fly very high in the sky. Air must be pumped into the plane so that the passengers can breathe. The metal structure (结构)of the plane has to be very strong for this reason. When the plane is filled with air, the air presses against the skin of the plane inside. The pressure (压力) on a small window is like a huge foot that is trying to get out. If a small part of the plane were to fail, the plane would explode (爆炸)in the sky. To test the structure of the plane, the plane is lowered into a huge tank or container of water. Then it is filled with air. The pressure inside the plane is greater than it ever will be when it is high up in the air. Finally, there is an explosion. This does not cause so much damage inside the water tank as it would anywhere else. Engineers can discover which part of the plane has broken. Then that part is made stronger.
The most dangerous test happens when the new plane is going through test flights in the air. The pilot must find out exactly what happens when the engines (发动机) are all shut off at once. The plane begins to fall like a stone. It is the pilot’s job to find out how he can get control of the plane again. These two tests are examples of how planes are made safe before they ever carry passengers.
【小题1】By doing the "tank test", the engineers can find out _______.
| A．the amount of air in the plane | B．the strength of the plane structure |
| C．the pressure inside and outside the plane | D．the power of the airplane engines |
| A．It will be broken. | B．It will be made stronger. |
| C．It will be filled with water. | D．It will be tested by pilots, |
| A．The plane may explode in the air. | B．The pilot may lose control of the plane. |
| C．The engines may be damaged. | D．Too much air may get into the plane. |
| A．Two Important Tests on Airplanes | B．The Importance of Flying Safely |
| C．The Danger of Testing Airplanes | D．How Airplanes Are Made and Tested |
【小题1】B
【小题1】A
【小题1】B
【小题1】A
解析
一课一练课时达标系列答案“Racism (种族歧视) is a grown-up disease,” declares the saying on Ruby Bridge’s website along with a photo of Mrs. Bridge today, a 6-year-old girl four decades ago. In the photo, she is walking up the steps of the William Frantz Public School in New Orleans, a little black girl accompanied by two officers who protect her on her way to school.
Her name then was Ruby Nell. It was Nov. 14, 1960. She was the first black child to enroll at this all-white elementary school according to the court order to desegregate in New Orleans schools. Her story is moving -- she was a very courageous child -- and remains a significant proof against intolerance (不宽容) of all kinds. Ruby’s photo brings out another powerful image on her website: Norman Rockwells symbolic painting for Look magazine on Jan. 14, 1964, “The Problem We All Live With.”
Rockwell was an illustrator of exceptional skill and charm. He produced a vast number of unforgettable images over a long career, many of them involving children. His American kids are innocent and appealing, but often, at the same time, decidedly naughty. His method was to photograph his models, and the resulting paintings were photographic． But it is revealing to see how the artist slightly changed facial expressions from photo to oil painting in order to make his paintings communicate with the viewer. Communication, even persuasion, lay at the back of his work; this was art for effect.
“The Problem We All Live With” belongs to Rockwell’s later work, when he began openly showing his strong belief in liberty. This is a highly persuasive image. Before he arrived at the final copy, one sketch (草图) shows the little girl closer to the two officers following her than to those in front. In the finished picture, the girl seems more determined, independent, and untouched． The unfriendly tomatoes thrown on the wall are behind her now, and she, is completely unaffected．
【小题1】Ruby Nell was protected by officers on her way to school, because .
| A．she was a little fighter against racism |
| B．she was very young, short and timid |
| C．she was the first black to study in an all-white school |
| D．she was chosen by the com t0be’wi’th white children |
| A．social program for American children |
| B．famous painting by Norman Rockwell |
| C．photo displayed on Ruby Bridges’ website |
| D．exhibition at the Norman Rockwell Museum |
| A．fight against the white | B．end racial separation |
| C．struggle for freedom | D．stop the black-white conflict |
| A．how Rockwell encouraged Ruby to fight against racism |
| B．how Ruby won her fight to go to an all-white school |
| C．how Rockwell expressed his protest in .Iris work |
| D．how persuasive Rockwell’s earlier work of art is |