When characters fall through the sky in cartoons，they often lie on clouds. What is a cloud？And what would it feel like to touch a cloud in real life？
    Believe it or not，many of us have already touched a cloud though we probably didn't realize it at the time. "Clouds are really little drops of water in the air，" says Kristina Pistone，a scientist from NASA. "If you've ever walked outside on a really①              day where you can't see very far，you're walking through a cloud，" Pistone said.That's because fog is just a kind of ②              that forms on the ground.
    According to the World Meteorological Organization，there are more than 100 kinds of clouds.But Pistone said that with a bit of practice，anyone can learn to recognize some of the more common clouds：

Altocumulus clouds（高積云）	They are white or gray round clouds.They look like the wool（羊毛）of sheep so they get the name"sheep backs".
Cumulonimbus clouds（積雨云）	They rise into towers and look like large flowers.
Cirrocumulus clouds（卷積云）	They are small，white clouds often appearing in lines.
Cirrus clouds（卷云）	They are thin，white pieces of clouds that lie across the sky.

Cloud color is also interesting.Black or dark clouds usually mean a storm is coming because they're so full of water that light can't pass through them.
    All of this is important for scientists to study because a lot of big white clouds help reflect（反射）heat back into space.云能對(duì)天氣變化起作用。
    So the next time you see a sky full of white clouds，think about all the ways those little water drops might be affecting the world around us - not only by raining or snowing，but by changing the planet's temperature!

（1）將劃線句子 When characters fall through the sky in cartoons，they often lie on clouds.譯為漢語(yǔ)。

當(dāng)卡通人物從空中墜落時(shí)，他們經(jīng)常躺在云端。

當(dāng)卡通人物從空中墜落時(shí)，他們經(jīng)常躺在云端。

（2）在①②處填入適當(dāng)?shù)脑~語(yǔ)，每空限填1詞。
①

foggy

foggy

②

cloud

cloud

（3）選出劃線詞匯 recognize 的漢語(yǔ)意思。

A

A

A.辨認(rèn)
B.混淆
C.影響
D.遺忘
（4）選出與四種云相匹配的圖片。
①Altocumulus clouds

B

B

②Cumulonimbus clouds

D

D

③Cirrocumulus clouds

A

A

④Cirrus clouds

C

C

（5）寫出劃線詞匯 them 指代的內(nèi)容。

Black or dark clouds.

Black or dark clouds.

（6）將劃線句子"云能對(duì)天氣變化起作用。"譯為英語(yǔ)。

Clouds can play a role in climate change.

Clouds can play a role in climate change.