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（積云）．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（微粒），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：About 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(chǎn) cumulus cloud  B．a(chǎn) tornado  C．a(chǎn) hurricane  D．a(chǎn) 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．

分析 本文屬于說明文閱讀，作者通過這篇文章主要向我們描述了氣象學(xué)專家對以多云和颶風(fēng)、一朵積云重量進(jìn)行測試，測量結(jié)果令人吃驚．

解答 67．B．細(xì)節(jié)理解題，由第一段第一行Ever wonder howmuch a cloud weighs？What about a hurricane和第二段第一行acumulus cloud可以知道a tornado沒有被提到，故選B．
68．C．細(xì)節(jié)理解題，由第一段最后一句Ameteorologist has done some estimates and the results might surprise you．可以知道Peggy LeMone對這個結(jié)果很驚訝，故選C．
69．C．細(xì)節(jié)理解題，由最后一段最后一句Perhaps evenmore than all the elephants that have ever lived on the planet可以知道地球上的大象不到4千萬，故選C．
70．D．主旨大意題：氣象學(xué)專家對云重量進(jìn)行測試，把云的數(shù)量和地上的大象進(jìn)行比較，就是把天上的云看成大象的重量，故選D．

點評 考察學(xué)生的細(xì)節(jié)理解和推理判斷能力，做細(xì)節(jié)理解題時一定要找到文章中的原句，和題干進(jìn)行比較，再做出正確的選擇．在做推理判斷題不要以個人的主觀想象代替文章的事實，要根據(jù)文章事實進(jìn)行合乎邏輯的推理判斷．

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