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4£®Ever wonder how much a cloud weighs£¿What about a hurricane£¿A meteorologist has done some estimates and the results might surprise you£®Let's start with a very simple white puffy cloud-a cumulus cloud£¨»ýÔÆ£©£®How much does the water in a cumulus cloud weigh£¿Peggy LeMone£¬senior scientist at the National Center for Atmospheric Research in Boulder£¬Colorado£¬did the numbers£®"The water in the little cloud weighs about 550tons£¬"she calculates£®"Or if you want to convert it to something that might be a little more meaningful ¡think of elephants£®"
The thought of a hundred elephants-worth of water suspended in the sky begs another question-what keeps it up there£¿
"First of all£¬the water isn't in elephant sized particles£¨Î¢Á££©£¬it's in tiny tiny tiny particles£¬"explains LeMone£®And those particles float on the warmer air that's rising below£®But still£¬the concept of so much water floating in the sky was surprising even to a meteorologist like LeMone£®"I had no idea how much a cloud would weigh£¬actually£¬when I started the calculations£¬"she says£®
So how many elephant units of water are inside a big storm cloud-10times bigger all the way around than the"puffy"cumulus cloud£¿Again£¬LeMone did the numbers£ºAbout 200£¬000elephants£®
Now£¬ratchet up the calculations for a hurricane about the size of Missouri and the figures get really massive£®"What we're doing is weighing the water in one cubic meter theoretically pulled from a cloud and then multiplying by the number of meters in a whole hurricane£¬"she explains£®
The result£¿Forty million elephants£®That means the water in one hurricane weighs more than all the elephants on the planet£®Perhaps even more than all the elephants that have ever lived on the planet£®
67£®The weight ofBis NOT mentioned in the passage£®
A£®a cumulus cloud B£®a tornado C£®a hurricane D£®a storm cloud
68£®How did Peggy LeMone feel about the result of her calculations£¿C
A£®She found it not convincing£®
B£®She thought it needed further calculations£®
C£®She was quite surprised at it£®
D£®She considered the calculations inaccurate£®
69£®What can be inferred from the passage£¿C
A£®A storm cloud weighs about 200£¬000elephants£®
B£®The water in a hurricane weighs more than that in any other kind of cloud£®
C£®There are less than forty million elephants living on the earth£®
D£®The water in the cloud is in very tiny partials£®
70£®What is the best title for the passage£¿D
A£®How Much a Cloud Weighs B£®How Much a Hurricane Weighs
C£®Surprising Results D£®Elephants in the Sky£®
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½â´ð 67£®B£®Ï¸½ÚÀí½âÌ⣬ÓɵÚÒ»¶ÎµÚÒ»ÐÐEver wonder howmuch a cloud weighs£¿What about a hurricaneºÍµÚ¶þ¶ÎµÚÒ»ÐÐacumulus cloud¿ÉÒÔÖªµÀa tornadoûÓб»Ìáµ½£¬¹ÊÑ¡B£®
68£®C£®Ï¸½ÚÀí½âÌ⣬ÓɵÚÒ»¶Î×îºóÒ»¾äAmeteorologist has done some estimates and the results might surprise you£®¿ÉÒÔÖªµÀPeggy LeMone¶ÔÕâ¸ö½á¹ûºÜ¾ªÑÈ£¬¹ÊÑ¡C£®
69£®C£®Ï¸½ÚÀí½âÌ⣬ÓÉ×îºóÒ»¶Î×îºóÒ»¾äPerhaps evenmore than all the elephants that have ever lived on the planet¿ÉÒÔÖªµÀµØÇòÉϵĴóÏó²»µ½4ǧÍò£¬¹ÊÑ¡C£®
70£®D£®Ö÷Ö¼´óÒâÌ⣺ÆøÏóѧר¼Ò¶ÔÔÆÖØÁ¿½øÐвâÊÔ£¬°ÑÔƵÄÊýÁ¿ºÍµØÉϵĴóÏó½øÐбȽϣ¬¾ÍÊÇ°ÑÌìÉϵÄÔÆ¿´³É´óÏóµÄÖØÁ¿£¬¹ÊÑ¡D£®
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