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that a person feels when a rocket leaves the ground．Anything that is not moving tends to keep still．As the rocket leaves the ground, it pushes upwards strongly and the person in it is pushed back against the chair．Gravity gives the body a force equal to nine times its normal force．The town of Pressure and the town Pleasure were neighbor but had 1 in common. Residents built walls to 2 influence from the 3 town.
In Pressure, everyone struggled to be the very best. When women 4 birth, they would compete to have the baby with the 5 cry. There was violent competition in every aspect of life. Because 6 was the index(指数) of success, people were always 7 making money, with no time for relaxation.
8 , over in Pleasure, the motto was “As long as you like it, do it.” People 9 without pressure and could do 10 they liked. Children played computer games day and night. At school, teachers didn’t care 11 students showed up or not. Workers might sit around the office 12 sipping coffee and doing nothing. 13 the lack of regulations, nobody worried about losing their jobs. No one had the slightest thought of moving 14 , either for themselves or for the town. The computers they used were 15 models from Pressure.
Some of the young were addicted to 16 because of the emptiness of their lives. Then, people in the two towns began asking themselves, “What is life 17 ?” But, just before life in the two towns completely failed. There came a saint－Mr. Reason. He went from door to door, 18
with people and giving advice. People in Pressure learnt to be content with what they had, while people in Pleasure began to make plans. They 19 walls between them and built a road to connect the two. The town people 20 to realize the truth－There is no space between Pressure and Pleasure if people don’t go to extremes.
1．A．anything B．nothing C．everything D．something
2．A．keep out B．look out C．work out D．give out
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4．A．gave B．took C．offered D．brought
5．A．loud B．louder C．loudest D．loudly
6．A．health B．healthy C．wealth D．wealthy
7．A．busy B．lazy C．easy D．hard
8．A．Meanwhile B．At that time C．At one time D．Once in a while
9．A．got up B．grew up C．set up D．brought up
10．A．nothing B．something C．anything D．everything
11．A．what B．who C．where D．whether
12．A．all way B．all night C．all way long D．all day long
13．A．Thanks to B．Because C．Owe to D．According to
14．A．backward B．forward C．upward D．downward
15．A．new B．old C．right D．advanced
16．A．work B．money C．drugs D．books
17．A．for B．at C．in D．to
18．A．talked B．to talk C．talks D．talking
19．A．pulled down B．put down C．went down D．wrote down
20．A．went B．returned C．happened D．came
查看习题详情和答案>>The town of Pressure and the town of Pleasure were neighbors but had 1 in common. Residents built walls to 2 influence from 3 town. .
In Pressure, everyone struggled to be the very best. When women 4 birth, they would compete to have the baby with the 5 cry. There was violent competition in every aspect of life Because 6 was the index（指数） of success, people were always 7 making money, with no time for relaxation.
8 ，over in Pleasure, the motto was “As long as you like it, do it. ” People 9 without pressure and could do 10 they liked. Children played computer games day and night. At school, teachers didn’t care 11 the students showed up or not. Workers might sit around the office 12 sipping coffee and doing nothing. 13 the lack of regulations, nobody worried about losing their jobs. No one had slightest thought of moving 14 , either for themselves or for the town. The computer they used were 15 models from Pressure.
Some of the young were addicted to 16 because of the emptiness of their lives. Then, people in the two towns began asking themselves, “What is life 17 ?” But, just be- fore life in the two towns completely failed, there came a saint-Mr. Reason. He went from door to door, 18 with people and giving advice. People in Pressure learnt to be content with what they had, while people in Pleasure began to make plans. They 19 walls between them and built a road to connect the two. The town people 20 to realize the truth — There is no space between Pressure and Pleasure if people don’t go to extremes.
1．A．anything B．nothing C．everything D．something
2．A．keep out B．look out C．work out D．give out
3．A．another B．any C．other D．the other
4．A．gave B．took C．offered D．brought
5．A．loud B．louder C．loudest D．loudly
6．A．health B．healthy C．wealth D．wealthy
7．A．busy B．lazy C．easy D．hard
8．A．Meanwhile B．At that time C．At one time D．Once in a while
9．A．got up B．grew up C．set up D．brought up
10．A．nothing B．something C．anything D．everything
11．A．what B．who C．where D．whether
12．A．all way B．all night C．all way long D．all day long
13．A．Thanks to B．Because C．As a result D．According to
14．A．backward B．forward C．upward D．downward
15．A．new B．old C．right D．advanced
16．A．work B．money C．drugs D．books
17．A．for B．at C．in D．to
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19．A．pulled down B．put down C．went down D．wrote down
20．A．went B．returned C．happened D．came
查看习题详情和答案>>Study carefully both the figure and the passage and answer the following questions:
If a plane is standing on the ground, the air pressure on all its different parts is the same． This air pressure is increased or reduced when the plane moves．
There are four forces which act on a plane as it flies through the air． The weight of the plane, because of the earth’s gravitation, a drawing force towards its centre, always pulls the plane downward． Drag prevents and delays the forward movement of the plane ． Drag is caused by the opposite force the airframe or the body of the plane offers as it moves through the air and by the whirling or turning movements of air which form near edges of the lifting surfaces of the plane． Weight and drag are successfully defeated by thrust, a forceful forward movement, and lift, an upward air pressure on the wings of the plane． Thrust is provided or supplied by the engines which drive the plane forward． As the plane moves forward, the air flowing over the wings produces lift to raise the plane off the ground , and keep it in the air．
The upper surface of a plane wing is made a rounded line like thisÉ at the leading edge while the under surface is almost flat to give the highest lift/drag ratio(such as 2:1 or 3:2．) ． A rounded nose smoothly rounded top and a sharp tail is known as aerofoil （翼型）shape or the shape of the wings , the fin or tail plane of a plane． This particular shape makes air flow faster and farther over the wing than under it． Pressure above the wing is reduced and the wing is given lift． The amount of lift increases with the speed of the plane．
1． When the plane is standing on the ground the pressure on its upper surface is that of its under surface．
A． the same as B． different from C． larger than D． smaller than
2． When the plane moves , the air pressure on its body is ．
A． the same B． changing C． unchanging D． neither A nor B nor C
3． When the plane is flying, the four forces are acting on it in ．
A． the same direction B． two different directions
C． three different directions D． four different directions
4． The backward force acting on the flying plane is ．
A． the earth's gravitation B． drag C． lift D． thrust
5． In the picture, A, B, C, D stand for ．
A． the earth's gravitation, drag, lift, thrust
B． drag, lift, thrust, the earth's gravitation
C． lift, thrust, the earth’s gravitation, drag
D． thrust, the earth’s gravitation, drag, lift
6． Drag is the opposite force of ．
A． lift B． weight C． thrust D． whirling movements
7． seems the most important of the four forces in making the plane take off and fly through the air．
A． lift B． weight C． thrust D． the earth’s gravitation
8． Part M in the picture is called the edge of the plane wing．
A． leading B． rounded C． sharp D． upper
9． Aerofoil shape includes part and part in the picture．
A． M , N B． N , S C． S , D D． D , M
10． Which of the following statements is TRUE?
A． The faster the plane flies the easier it rises．
B． The higher Force D is the faster the plane goes up．
C． The stronger Force C is the faster the plane flies．
D． The sharp leading edge of the wing increases the air flow over it．
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