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（2024·）閱讀短文，從下面所給的選項(xiàng)中選出可以填入空白處的最佳選項(xiàng)，其中有一個(gè)多余的選項(xiàng)。

That one looks like a rabbit. Or is the larger oneawhale？Whatever shape they take，they're clouds.So what are clouds，exactly？_17

·Cloudsare floating（浮動(dòng)的）water.

Clouds are made of small water drops.Each drop is made of many flying water molecules（分子）.They stay together around a tiny piece of dust （塵埃）or salt.How small are cloud drops？A shoebox of clouds might hold millions of cloud drops.

Cloudslook lightand soft，but theyhold much water.And wateris heavy.The water in an average cotton-ball cloud may weigh as much as a group of elephants.

·Things live in clouds.

Haveyou ever dreamed of living ona cloud？It wouldprobablybe cold and wet，with no place to sit down.But weatherballoons have discovered insects inside clouds as high as 20 miles above the earth._19__Airplanepilotshave everfound butterfliesat1O.OoO feet.

·Clouds don't last.

Clouds are always changing. They form and then change into gas soon. They are changing shapes as the wind blows them across the sky. Will the shapes stay long？_2O__But some small soft clouds often last 10 minutes.

So take a look at the cloud before it disappears-what does that cloud looklike？

A. Clouds are heavy.

B. Clouds look like elephants.

C. Some big clouds can hang around all day.

D. The following can help you know more about them.

E.Most of the insects inside clouds are blown there by the wind.

【答案】17.D 18.A 19.E 20.C【文章大意】本文主要介紹關(guān)于云的一些事實(shí)。（剩余416字）