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Have you ever wondered?
1. Why do airplanes take longer to fly west than east?
It can take five hours to go west-east from New York(NY) to London but seven hours to travel east-west from London to NY. The reason for the difference is an atmospheric phenomenon known as the jet(喷射) stream. The jet stream is a very high altitude wind which always blows from the west to the east across the Atlantic. The planes moving at a constant air speed thus go faster in the west-east direction when the air moving with the wind than in the opposite direction.
2. What would happen if the gravity(重力) on Earth was suddenly turned off?
Supposing we could magically turn off gravity. Would buildings and other structures float away? What happened would depend on how strongly the things were attached to the Earth. The Earth is moving at quite a speed moving at over a thousand miles per hour. If you turn something round your head on a string, it goes around in a circle until you let go of the string. Then it flies off in a straight line. “Switching off ” gravity would be like letting go of the string. Things not attacked to the Earth would fly off in a straight line . People in buildings would suddenly shoot upwards at a great speed until they hit the ceiling. Most things would fly off into space.
What information can we get from the first passage?
A. It is the jet stream that affects how fast airplanes fly.
B. Planes go slower when they are moving with the wind.
C. It takes more time to fly from NY to London than from London to NY.
D. The jet stream always blows from the east to the west across the Atlantic.
The word “shoot” underlined in the 2nd passage probably means“ ”.
A. send for B. move quickly C. come out D. grow quickly
It can be inferred that without gravity .
A. buildings and other structures would float away
B. trees and buildings would not so easily fly off
C. something around your head would not float away
D. everything outside buildings would fly off into space
Where can we most probably read this text?
A. In a research paper. B. In a short story.
C. In a travel magazine. D. In a students’ book
查看习题详情和答案>>Have you ever wondered?
1. Why do airplanes take longer to fly west than east?
It can take five hours to go west-east from New York(NY) to London but seven hours to travel east-west from London to NY. The reason for the difference is an atmospheric phenomenon known as the jet(喷射) stream. The jet stream is a very high altitude wind which always blows from the west to the east across the Atlantic. The planes moving at a constant air speed thus go faster in the west-east direction when the air moving with the wind than in the opposite direction.
2. What would happen if the gravity(重力) on Earth was suddenly turned off?
Supposing we could magically turn off gravity. Would buildings and other structures float away? What happened would depend on how strongly the things were attached to the Earth. The Earth is moving at quite a speed moving at over a thousand miles per hour. If you turn something round your head on a string, it goes around in a circle until you let go of the string. Then it flies off in a straight line. “Switching off ” gravity would be like letting go of the string. Things not attacked to the Earth would fly off in a straight line . People in buildings would suddenly shoot upwards at a great speed until they hit the ceiling. Most things would fly off into space.
1.What information can we get from the first passage?
A. It is the jet stream that affects how fast airplanes fly.
B. Planes go slower when they are moving with the wind.
C. It takes more time to fly from NY to London than from London to NY.
D. The jet stream always blows from the east to the west across the Atlantic.
2.The word “shoot” underlined in the 2nd passage probably means“ ”.
A. send for B. move quickly C. come out D. grow quickly
3.It can be inferred that without gravity .
A. buildings and other structures would float away
B. trees and buildings would not so easily fly off
C. something around your head would not float away
D. everything outside buildings would fly off into space
4. Where can we most probably read this text?
A. In a research paper. B. In a short story.
C. In a travel magazine. D. In a students’ book
查看习题详情和答案>>
Have you ever wondered?
1.Why do airplanes take longer to fly west than east?
It can take five hours to go west-east from New York(NY) to London but seven hours to travel east-west from London to NY. The reason for the difference is an atmospheric phenomenon known as the jet(喷射) stream. The jet stream is a very high altitude wind which always blows from the west to the east across the Atlantic. The planes moving at a constant air speed thus go faster in the west-east direction when the air moving with the wind than in the opposite direction.
2.What would happen if the gravity(重力) on Earth was suddenly turned off?
Supposing we could magically turn off gravity. Would buildings and other structures float away? What happened would depend on how strongly the things were attached to the Earth. The Earth is moving at quite a speed moving at over a thousand miles per hour. If you turn something round your head on a string, it goes around in a circle until you let go of the string. Then it flies off in a straight line. “Switching off ” gravity would be like letting go of the string. Things not attacked to the Earth would fly off in a straight line . People in buildings would suddenly shoot upwards at a great speed until they hit the ceiling. Most things would fly off into space.
1.What information can we get from the first passage?
A. It is the jet stream that affects how fast airplanes fly.
B. Planes go slower when they are moving with the wind.
C. It takes more time to fly from NY to London than from London to NY.
D. The jet stream always blows from the east to the west across the Atlantic.
2.The word “shoot” underlined in the 2nd passage probably means“ ”.
A. send for B. move quickly C. come out D. grow quickly
3.It can be inferred that without gravity .
A. buildings and other structures would float away
B. trees and buildings would not so easily fly off
C. something around your head would not float away
D. everything outside buildings would fly off into space
4.Where can we most probably read this text?
A. In a research paper. B. In a short story.
C. In a travel magazine. D. In a students’ book
查看习题详情和答案>>
1.Why do airplanes take longer to fly west than east?, It can take five hours to go westeast from New
York (NY) to London but seven hours to travel eastwest from London to NY.The reason for the
difference is an atmospheric phenomenon known as the jet(喷射) stream.The jet stream is a very high
altitude wind which always blows from the west to the east across the Atlantic.The planes moving at a
constant air speed thus go faster in the westeast direction when they are moving with the wind than in the
opposite direction.
2.What would happen if the gravity on Earth was suddenly turned off?, Supposing we could magically
turn off gravity.Would buildings and other structures (建筑物) float away? What happened would
depend on how strongly the things were attached to the Earth.The Earth is moving at quite a speed,
moving at over a thousand miles per hour.If you turn something around your head on a string(细绳), it
goes around in a circle until you let go of the string.Then it flies off in a straight line.'Switching off' gravity
would be like letting go of the string.Things not attached to the Earth would fly off in a straight line.People
in buildings would suddenly shoot upwards at a great speed until they hit the ceiling.Most things outside
would fly off into space.
1. What information can we get from the first passage?
A. It is the jet stream that affects how fast airplanes fly.
B. Planes go slower when they are moving with the wind.
C. It takes more time to fly from NY to London than from London to NY.
D. The jet stream always blows from the east to the west across the Atlantic.
2. The word"shoot"underlined in the 2nd passage probably means"________".
A. send for
B. move quickly
C. come out
D. grow quickly
3. It can be inferred that without gravity________.
A. buildings and other structures would float away
B. trees and buildings would not so easily fly off
C. something around your head would not float away
D. everything outside buildings would fly off into space
4. Where can we most probably read this text?
A. In a research paper.
B. In a short story.
C. In a travel magazine.
D. In a student's book.
Why do airplanes take longer to fly west than east?
It can take five hours to go west-east from New York (NY) to London but seven hours to travel east-west
from London to NY. The reason for the difference is an atmospheric phenomenon known as the jet (喷射)
stream. The jet stream is a very high altitude wind which always blows from the west to the east across the
Atlantic. The planes moving at a constant air speed thus go faster in the west-east direction when they are
moving with the wind than in the opposite direction.
What would happen if the gravity on Earth was suddenly turned off?
Supposing we could magically turn off gravity. Would buildings and other structures (建筑物) float away?
What happened would depend on how strongly the things were attached (附着) to the Earth. The Earth is
moving at quite a speed, moving at over a thousand miles per hours. If you turn something around your head
on a string (细绳), it goes around in a circle until you let go of the string. Then it flies off in a straight line.
'Switching off' gravity would be like letting go of the string. Things not attached to the Earth would fly off in
a straight line. People in buildings would suddenly shoot upwards at a great speed until they hit the ceiling.
Most things outside would fly off into space.
B. Planes go slower when they are moving with the wind
C. It takes more time to fly from NY to London than from London to NY
D. The yet stream always blows from the east to the west across the Atlantic.
B. move quickly
C. come out
D. grow quickly
B. trees and buildings would not easily fly off
C. something around your head would not fly away
D. everything outside buildings would fly off into space