Question

    Clouds are made of small drops of water or tiny pieces of ice. The water and ice in clouds come from the Earth ’s surface，especially from lakes，rivers，and oceans. Water on the surface is heated. It changes into a gas called water vapor(水蒸气). Water vapor goes up into the air.

The higher up you go，the colder the air gets. When water vapor gets cold，it changes back into drops of water. If it gets cold enough，the water changes to ice. When the drops of water and bits of ice are so small，you see the water and ice in the sky as clouds. Scientists who study weather divide clouds into three families. Three families are called high clouds，middle clouds，and low clouds.

High clouds are made of bits of ice. High clouds can be 5 miles or more above the Earth’s surface. Rain and snow do not fall from these clouds.

Middle clouds are made of drops of water. They form about 2 to 4 miles up in the sky. You can see through them，but you can’ t see the Sun and the Moon clearly because of them.

Low clouds are made of drops of water. Most low clouds are less than a mile high. Rain or snow usually falls from these clouds.

1.Where do the water and ice in clouds come from?

The water and ice in clouds come from____________.

2.When does the water vapor change back into drops of water?

When water vapor____________，it changes back into drops of water.

3.Why can’ t you see the sun and the moon clearly?

You can’t see the sun and the moon clearly because of _____________.

4.What does “It” refer to in the first paragraph?

It refers to______________.

5.Where does the rain or snow usually fall from?

Rain or snow usually falls from________________.

Answer

1.the Earth’s surface

2.gets cold

3.middle clouds

4.water

5.low clouds

【解析】

这篇短文主要讲述了云的相关知识，科学家把云分为三类。三个家族被称为高云、中云和低云。

1.题干“云中的水和冰是从哪里来的” 根据文中“The water and ice in clouds come from the Earth ’s surface” 云中的水和冰来自地球表面。come from…来自，这里是来自地球表面；故答案为the Earth’s surface。

2.题干“水蒸气什么时候会变成水滴？”根据文中“When water vapor gets cold，it changes back into drops of water.” 当水蒸气变冷时，它会变成水滴。根据下文“it changes back into drops of water.”可知，此处是“当水蒸气变冷”。短语get cold变冷。主语是不可数名词，谓语动词变第三人单数。故答案为gets cold。

3.题干“为什么你看不清太阳和月亮？”根据文中“Middle clouds are made of drops of water. They form about 2 to 4 miles up in the sky. You can see through them，but you can’ t see the Sun and the Moon clearly because of them.” 中间的云是由水滴构成的。它们在空中形成大约2到4英里。你能看穿它们，但因为它们你看不清太阳和月亮。可知，这里是因为它们你看不清太阳和月亮，because of由于……的原因，because of middle clouds由于中云。故答案为middle clouds。

4.题干“第一段中“它”指的是什么？”根据上文“ Water on the surface is heated.” 表面的水被加热。可知，此处it指的是水。water名词，水。故答案为water。

5.题干“雨或雪通常从哪里落下？” 根据文中“Low clouds are made of drops of water. Most low clouds are less than a mile high. Rain or snow usually falls from these clouds.” 低云是由水滴构成的。大多数低云的高度不到一英里。雨雪通常是从这些云上落下的。可知，雨雪通常是从低云落下的。low clouds低云。故答案为low clouds。