李勃良

People in cities use a lot of water—for cooking， washing， drinking， and so on. Rain is the main source （來源） of new water. Unfortunately， it doesn't always rain enough （足夠的）. That can be big trouble for cities.

Sometimes， we can help make rain. To do this， a special airplane flies up to the clouds. Then， it lets out some chemicals. These chemicals cause clouds to make rain. This is called “seeding clouds”. Seeding clouds can help bring water to thirsty cities.

【詞匯拓展】

1. unfortunately 不幸地 2. fly 飛 3. chemical 化學(xué)制品 4. cause 引起;導(dǎo)致 5. thirsty 口渴的

I. 詞匯練習(xí)

1. Typhoons （臺風(fēng)） ________ a lot of trouble for people and cities.

2. Give the ________ baby something to drink.

3. ________， I can't go with you to the mall.

4. Many birds ________ south in winter.

II. 閱讀練習(xí)

根據(jù)短文內(nèi)容回答下列問題。

1. Where does new water come from？

A. Rivers? ? ? B. Lakes? ? ?C. Rain? ? ?D. Mountains

2. According to the article， without enough rain ________.

A. people do a lot of cooking B. people use more water

C. cities look for other sources of water D. cities have problems

3. What is “seeding clouds”？

A. A kind of cloud. B. A way to make rain.

C. Chemicals. D. A special airplane.

4. What happens first？

A. Special airplanes let out chemicals.

B. An airplane flies up high in the sky.

C. Cloud seeding causes clouds to make rain.

D. It rains a lot.