[填空题][A] dog
[B] water
[C] cat
[D] earth
[E] air
[F] horse
[G] pig

You call its meat pork．

[填空题][A] dog
[B] water
[C] cat
[D] earth
[E] air
[F] horse
[G] pig

You grow plants in it．

[单项选择]

Water on the earth is being continuously recycled in a process known as the hydrologic cycle. The first step of the cycle is the evaporation of water in the oceans. Evaporation is the process of water turning into vapor, which then forms clouds in the sky. The second step is the water returning to the earth in the form of precipitation, either rain, snow, or ice. When the water reaches the earth’s surface, it runs off into the rivers, lakes, and the ocean, where the cycle begins again.
Not all water, however, stays on the surface of the earth in the hydrologic cycle. Some of it seeps (渗透) into the ground through infiltration and collects under the earth’s surface as groundwater. This groundwater is extremely important to life on earth since 95% of the earth’s water is in the oceans, and is too salty for humans of plants. Of the 5% on land, only 0.05% is above ground in rivers or lakes. The rest is underground water. This groundwater is plentiful and depe
A. Water Conservation
B. The Hydrologic Cycle
C. Underground Water
D. Polluted Groundwater

[简答题]Seen from space, our earth, with water coveting 70% of its surface，appears as a "blue planet". A) 如果从太空中看地球的话，地球像一个蓝色的行星，而且地球的表面70％都是水。 B) 地球表面的70％都被水覆盖着，从太空中看地球，它就像一颗蓝色的行星。 C) 从太空上看我们的地球，它的表面的70％都被水覆盖着，看上去像一颗蓝色的行星。 D) 从太空中看到地球的表面的70％都是水，它是一个蓝色的行星。

[单项选择]Seen from space, our earth, with water covering 70% of its surface, appears as a “blue planet”（）
A. 如果从太空中看地球的话，地球像一个蓝色的行星，而且地球的表面70%都是水。
B. 地球表面的70%都被水覆盖着，从太空中看地球，它就像一颗蓝色的行星。
C. 从太空上看我们的地球，它表面的70%都被水覆盖着，看上去像一颗蓝色的行星。
D. 从太空中看到地球的表面的70%都是水，它是一个蓝色的行星。

[填空题]

Water is the most common substance on earth. It covors more than 70 per cent of the earth’s
surface. It fills the oceans, rivers, and lakes, and is in the ground and in the air we breathe. Water is everywhere. Without water, there can be no life. In fact, every living thing consists mostly 0f water. 41)______
42)______ . Rain hammers at the land and washes soil into rivers. The oceans pound against the shores, chiseling cliffs and carrying away land. Rivers knife through rock, carve, canyons, and build up land where they empty into the sea. Glaciers plow valleys and cut down mountains.
43)______ . Land absorbs and releases heat from the sun quickly. But the oceans absorb and release the sun’s heat slowly. So breezes from the oceans bring warmth to the land in winter and coolness in summer.
Throughout history, water has been people’s slave and their master. Great civilizations have risen where water supplies were plentiful. They ha

[单项选择]{{B}}E{{/B}}