Question

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 know as the jet£¨ÅçÉ䣩stream£®The jet stream is a very high altitude wind which always blows from the west to the east across the Atlantic£®The planes movement a constants 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 on Earth was suddenly turned off?

Supposing we could magically turn off gravity£®Would buildings and other structures£¨½¨ÖþÎ 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£¨Ï¸Éþ£©£¬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 interred 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 s research paper                                     B£®In a short story£®

C£®In a travel magazine£®                                 D£®In a student¡¯s book£®

Answer 1

ABBD