题目内容
The gravity on Mars is only about ________ of the gravity on Earth．
A．three eight
B．third-eight
C．three-eighth
D．three-eighths
快乐5加2金卷系列答案It is said that the gravity on Mars is only about of the gravity on earth.
| A．three-eighths | B．third-eighth | C．third-eighths | D．third-eight |
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 (大气现象) known as the jet stream (气流). The jet stream is a very high altitude (=" above" sea level) wind which always blows from the west to the east across the Atlantic. So the planes moving at a constant air speed go faster from the west to the east when they are moving with the wind than in the opposite.
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 (依靠) how strongly the things were attached (吸附) 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, it goes around in a circle until you let go of the string. Then it flies off in a straight line. ‘Turning 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 (=" top" surface of a room). Most things outside would fly off into space.
【小题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. |
| A．send for | B．move quickly | C．come out | D．grow quickly |
| 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 |
| A．In a research paper. | B．In a short story. |
| C．In a travel magazine. | D．In a student’s book |
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 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.
【小题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. |
| A．send for | B．move quickly |
| C．come out | D．grow quickly |
| 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 |
| A．It takes seven hours to travel from London to New York. |
| B．The earth is moving at a high speed |
| C．Everything on the earth will float away if there’s no gravity. |
| D．Everything not attached to the earth would fly off in a straight line. |
| A．In a research paper. |
| B．In a short story. |
| C．In a travel magazine. |
| D．In a student’s book. |