阅读理解

    As we know, when the air warms up and rises, it has water vapor(水蒸气) in it. When the vapor hits particles of dust(尘埃粒子) in the air, it forms droplets(液滴). When these droplets become big and heavy, they fall to the earth as rain. Recently, Israeli scientists have discovered that air pollution may stop rain from falling.

    They found the smoke from cars and factories adds to the particles in the air. Because there are so many of these particles, more small droplets form, but they are not big enough to fall down as rain. These clouds are called dry clouds.

    The only way to get back rain is by cleaning up the environment. Or a time may come when clouds will form but no rain will fall.

阅读理解

    As we know, when the air warms up and rises, it has water vapor(水蒸气) in it. When the vapor hits particles of dust(尘埃粒子) in the air, it forms droplets(液滴). When these droplets become big and heavy, they fall to the earth as rain. Recently, Israeli scientists have discovered that air pollution may stop rain from falling.

    They found the smoke from cars and factories adds to the particles in the air. Because there are so many of these particles, more small droplets form, but they are not big enough to fall down as rain. These clouds are called dry clouds.

    The only way to get back rain is by cleaning up the environment. Or a time may come when clouds will form but no rain will fall.

从方框中选词并用其适当形式填空

describe; nobody; potato; reason; terrible

①What's your {#blank#}1{#/blank#} for asking for so much money, dear?

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③ —How's the food there in Europe during your vacation?

—It's really {#blank#}3{#/blank#}! They eat many things without cooking!

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—{#blank#}4{#/blank#}! I made it myself after ten minutes' hard work.

⑤ —Do you like eating vegetables?

—Yes. I like {#blank#}5{#/blank#} and tomatoes best.